1、3 IN 1: Bluetooth 5.1 AUX adapter, Bluetooth receiver (RX), Bluetooth transmitter (TX), call 3 in 1 design with higher compatibility and stability. Built in HD microphone, support hands free calling. 2、PLUG AND PLAY: Bluetooth AUX adapter with 3.5mm plug minimum size slim design, plug and play, no driver required, one key switch operation, easy and fast, clear status indicator. 3、15M RANGE: This Bluetooth transmitter receiver with Bluetooth version 5.1 is in operation to ensure that the transmitter provides a stable and reliable connection up to 15m. Low latency, lossless sound. 4、LONG BATTERY LIFE: Bluetooth AUX sound adapter has built in 150mAh rechargeable battery that supports working while charging. Super long battery life, about 8H in RX mode and 5H in TX mode. 5、COMPATIBLE DEVICES: Wireless transmitter receiver easily adds Bluetooth to your car speaker system, home speaker, speakers, wired headphones, computer, TV, amplifier, for Switch, etc, via 3.5 mm AUX plug.