The Bluetooth transmitter makes everything Bluetooth-enabled, lets you enjoy the fun of wireless, and can be paired with Bluetooth receivers (such as 2 headsets) simultaneously.Turn on the switch, the A / B blue light flashes, after the connection is successful, the blue light is always on, and the working status can be seen at a glance.This Bluetooth audio adapter makes your and other Bluetooth-enabled devices stream audio to your Bluetooth headphones.Low latency for clear fidelity stereo sound, lag-free content streaming in streamer mode, giving you a richer and sound experience. Plug and play.With a built-in 300mAh rechargeable battery, it only takes 1-2 hours to fully charge and runs for 6 hours.Name: Bluetooth adapterBluetooth version: Bluetooth V5.0Working frequency 2.402G -2.480GCharging voltage: DC 5VBluetooth protocol: 5.0 , A2DP, , AVRCPBluetooth compatible distance: 10m (open area)Output connection mode: AUX 3.5mmMaterial:plasticcolour:blackPackage Contents:1 * Bluetooth Audio Transmitter1 * 3.5mm Aux Cable1 * USB Charging CableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.