Aptx HD QCC3034 Bluetooth 5.0 Wireless Module Earphone Upgrade Cable for Original Headphones AS10 ZST ES4 ZSN Pro ZS10 AS16

Bluetooth 5.0 wireless module for earphones by KZ - supports Apt-X HD codec and includes a 3.5 mm connector with an L-shaped plug. Neckband style with built-in microphone, volume control and control button. Not waterproof; does not support memory cards or app control. Sensitivity listed as 120± 3 dB and resistance around 20 Ω.