12V 8-Channel Relay Module,8-Channel 12V Relay Shield Module for Arduino UNO 2560 1280 ARM PIC AVR STM

Exactly what I expected. Works fine and seems to be engineered to a high standard.If you are going to use these in a project, here are a few notes I hope you will find useful.Notes:1) The relays require a 12v source2) Relays activate when the signal pin for that relay is connected to ground.3) I connected my Raspberry Pi to these signals via ILQ74 opto isolators, the output side pairs are connected between 0V from the relay board and the signal pin for each relay. The opto isolators input sides are connected to Raspberry pi 0v and the signals are from GPIO.4) Each relay has quite a bright LED on the board which lights when the relay is energised.5) I am only switching low voltage DC, so I can't comment on the level of insulation on the relays.... the y say they are rated for 10A 240VAC6) There is a jumper on the board - which I didn't change from it's inital setting..... there is no documentation of what this jumper is for.I can recommend this product without reservation. I paid £5 for mine from China.... so 4 weeks delivery... at which price it is a bargain.

Misleading title 'for arduino' - the relay board runs 12v switches - arduino only put out 3.3-5v, make sure if you are running this straight from the arduino to bare this in mind. It is probably a good product, however i havent managed to use it properly.

Not used yet but they look well made

Excellent quality .worked flawlessly

Good

Just as expected work perfected. good packing

Works well