--- product_id: 174331916 title: "Bluetooth Headset, K21 Business Headphones Wireless Earphones with Microphone Single Earpiece with Noise Reduction Mic" brand: "zerone" price: "€ 35.53" currency: EUR in_stock: true reviews_count: 9 category: "Zerone" url: https://www.desertcart.hr/products/174331916-bluetooth-headset-k21-business-headphones-wireless-earphones-with-microphone-single store_origin: HR region: Croatia --- # Ergonomic 180° rotating fit Bluetooth 5.0, 10m range 48h talk time, 70d standby Bluetooth Headset, K21 Business Headphones Wireless Earphones with Microphone Single Earpiece with Noise Reduction Mic **Brand:** zerone **Price:** € 35.53 **Availability:** ✅ In Stock ## Summary > 🎧 Elevate your calls with comfort and clarity—never miss a beat or a meeting! ## Quick Answers - **What is this?** Bluetooth Headset, K21 Business Headphones Wireless Earphones with Microphone Single Earpiece with Noise Reduction Mic by zerone - **How much does it cost?** € 35.53 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/174331916-bluetooth-headset-k21-business-headphones-wireless-earphones-with-microphone-single) ## Best For - zerone enthusiasts ## Why This Product - Trusted zerone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Noise Reduction Mic:** Crystal-clear conversations even in noisy environments—perfect for busy professionals on the move. - • **Next-Gen Bluetooth 5.0:** Experience stable, lag-free calls and music up to 10 meters away with cutting-edge wireless tech. - • **Unmatched Battery Life:** Stay connected with 48 hours of talk time and an ultra-long 70-day standby—charge less, do more. - • **Ergonomic All-Day Comfort:** Snug, over-the-ear design with 180° rotating earphone head for a perfect fit on either ear—wear it all day without fatigue. - • **Seamless Control & Compatibility:** One multifunctional key simplifies your experience, compatible with virtually all Bluetooth devices for effortless connectivity. ## Overview The Zerone K21 Bluetooth Headset combines a powerful 300mAh battery delivering up to 48 hours of talk time and 70 days standby, with Bluetooth 5.0 for stable connections up to 10 meters. Its ergonomic, sweat-resistant design features a 180° rotating earphone for customizable comfort, while CVC noise reduction ensures crystal-clear calls. Ideal for professionals seeking reliable, all-day wireless communication with simple controls and broad device compatibility. ## Description The Bluetooth earphone with noise reduction mic will bring you crystal clear sound and guarantee a clear phone call even in noisy environment. Ideal for workout use and for driver/trucker to with people on the go. Amazing ultra long standby of up to 70 days, making that you do not have to frequently charge it if not use it very often. This wireless headset will add you more convenience and make your life more high-efficiency. You can check the remaining battery power on iOS device, like for iOS One multifunctional key for easier than conventional earphone with many control buttons. Unique CD-design, also comfortable to the touch. Ergonomically-shaped and over-the ear design for snug fit around your ear, cause no burden even after long-time wearing. The 180° rotating earphone head allows you to adjust the angle and fit this headset in right or left ear. Specifications: Color: Black Material: ABS + Silicone Connectivity: Bluetooth Bluetooth Version: 5.0 Range: 8-10 meters / 26.2-32.8 feet (open area) Music time: About 24 hours Call Time: About 48 hours Standby Time: About 70 days Charging Time: About 2.5 hours Battery Capacity: 300mAh Language: Chinese / English Product Size: Approx. 65 * 45 * 18 mm / 2.5 * 1.8 * 0.7 in Package Weight: About 85g Package List: 1 x Bluetooth Headset 1 x USB Charging Cable 2 x Replacement Earbud Tip (Other items in the pictures are not included.) Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. ## Features - Built-in Large-capacity Battery: Supports more than 48 hours of talk time and ultra long standby of up to 70 days based on a single full charge which only takes about 2.5-hour charging. - Adopting Bluetooth 5.0 Technology: Enable stable signal and long working range of up to 8-10 meters in open area. CVC noise reduction technology maximizes signal quality for clearer and stabler phone call. - Design: Ideal for sports and daily use, sweat will not affect the normal use of the headset. Ergonomically-shaped and over-the ear design for snug fit around your ear, cause no burden even after long-time wearing. The 180° rotating earphone head allows you to adjust the angle and fit this headset in right or left ear. - Convenient to Use: You can check the remaining battery power, one multifunctional key for easier than conventional earphone with many control buttons. Unique CD-design, also comfortable to the touch. - Wide Compatibility: This earphone is compatible with almost all Bluetooth-enabled cellphones, tablets and other devices. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07C3X82JN | | Additional Features | Microphone Included, sports-and-exercise, water-resistant, wireless | | Age Range Description | Adult | | Antenna Location | Calling, Exercising | | Audio Driver Type | Dynamic Driver | | Battery Average Life | 24 Hours | | Battery Charge Time | 2.5 Hours | | Best Sellers Rank | #194,872 in Electronics ( See Top 100 in Electronics ) #3,334 in Over-Ear Headphones | | Bluetooth Range | 10 Meters | | Bluetooth Version | 5.0 | | Brand | Zerone | | Brand Name | Zerone | | Cable Features | Without Cable | | Color | Black | | Compatible Devices | Cellphones, Tablets, Laptops, Desktops | | Connectivity Technology | Wireless | | Control Method | Touch | | Control Type | Touch Control | | Controller Type | Integrated | | Customer Reviews | 3.8 out of 5 stars 43 Reviews | | Ear Placement | Over Ear | | Earpiece Shape | Over-Ear, Hook | | Enclosure Material | Acrylonitrile Butadiene Styrene (ABS), Silicone | | Form Factor | Over Ear | | Frequency Range | 20 Hz - 20,000 Hz | | Headphone Folding Features | Over Ear | | Headphone Jack | USB | | Headphones Ear Placement | Over Ear | | Headphones Jack | USB | | Is Autographed | No | | Manufacturer | Zerone | | Model Name | Zeroneko04sgat19 | | Model Number | Zeroneko04sgat19 | | Noise Control | Active Noise Cancellation | | Number of Items | 1 | | Specific Uses For Product | Business | | Style Name | Modern | | Theme | Professional and Active Lifestyle | | UPC | 654936821576 | | Unit Count | 1.0 Count | | Water Resistance Level | Waterproof | | Wireless Technology | Bluetooth | ## Product Details - **Brand:** Zerone - **Color:** Black - **Ear Placement:** Over Ear - **Form Factor:** Over Ear - **Noise Control:** Active Noise Cancellation ## Images ![Bluetooth Headset, K21 Business Headphones Wireless Earphones with Microphone Single Earpiece with Noise Reduction Mic - Image 1](https://m.media-amazon.com/images/I/618IjsKtBgL.jpg) ![Bluetooth Headset, K21 Business Headphones Wireless Earphones with Microphone Single Earpiece with Noise Reduction Mic - Image 2](https://m.media-amazon.com/images/I/51TOJu5uMNL.jpg) ![Bluetooth Headset, K21 Business Headphones Wireless Earphones with Microphone Single Earpiece with Noise Reduction Mic - Image 3](https://m.media-amazon.com/images/I/61kNgc+CIZL.jpg) ![Bluetooth Headset, K21 Business Headphones Wireless Earphones with Microphone Single Earpiece with Noise Reduction Mic - Image 4](https://m.media-amazon.com/images/I/613MpBnCvGL.jpg) ![Bluetooth Headset, K21 Business Headphones Wireless Earphones with Microphone Single Earpiece with Noise Reduction Mic - Image 5](https://m.media-amazon.com/images/I/71M5cgczd+L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by F***R on June 20, 2019* ### ⭐⭐⭐ Review *by J***N on September 8, 2019* ### ⭐⭐⭐⭐⭐ Review *by P***O on April 23, 2023* ## Frequently Bought Together - Zerone Bluetooth Headset, K21 Business Headphones Wireless Earphones with Microphone Single Earpiece with Noise Reduction Mic - New bee Bluetooth Earpiece V5.0 Wireless Handsfree Headset 24 Hrs Driving Headset 60 Days Standby Time with Noise Cancelling Mic Headsetcase for iPhone Android Samsung Laptop Truck Driver, Gold - NANAMI Bluetooth Headset, Bluetooth Earpiece V5.0, 320Hrs Ultralight Headphones with Rotatable Mic, Hands-Free Earphones, Noise Cancelling, in-Ear Earbuds for iPhone Android Cell Phone/Laptop/Trucker --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/174331916-bluetooth-headset-k21-business-headphones-wireless-earphones-with-microphone-single](https://www.desertcart.hr/products/174331916-bluetooth-headset-k21-business-headphones-wireless-earphones-with-microphone-single) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-25*