Would the headset and waistband fit an 8 year old? I'm worried they might be too big, even though they are adjustable.

I believe it will fit an eight year old, it is very adjustable.

I see that the usb end plugs into amplifier but what does the other end of the charging cable plug into in order to charge?

You can use the USB charging cable to plug into a charging head, or you can plug the other end of the charging cable into an outlet with a USB port.

Terrible interference noise! First test I ran: mic. on head, speaker hanging on the back of my pants. Anyone else had this issue?

You have to wear it in the front, and not be near any other mic, or any other amplifier to not get interference. That is what I do and I don't have any problems.

Connector Type	AUX
Item Weight	181 g
Number of Channels	1
Manufacturer	VOVIGGOL
UPC	768484981658
Color Name	ブラック
Batteries Included	No
Batteries Required	No
Item Model Number	1
Product Dimensions	9.2 x 8.4 x 2.8 cm; 181.44 g

ポータブル音声アンプ 教師用 2200mAh 充電式パーソナルアンプ マイク PAシステム ヘッドセットマイク スピーカー付き 教師 トレーニング 会議 ツアーガイド ヨガ 教室用 (ブラック)

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ポータブル音声アンプ教師用 2200mAh 充電式パーソナルアンプマイク PAシステムヘッドセットマイクスピーカー付き教師トレーニング会議ツアーガイドヨガ教室用 (ブラック)