Features:1. It adopts Bluetooth 5.1 chip design, which has stronger compatibility and stability. It has a three-in-one design of Bluetooth receiver (RX), Bluetooth transmitter (TX) and call. 2. Wired to wireless upgrade in seconds, connected to ordinary speakers, shocking sound effects, equipped with AUX car Bluetooth speakers, enjoy mobile music, voice navigation, and broadcast. 3. Support the TV transmission mode, solve the problem that the TV cannot connect to the Bluetooth headset, support 10~15 meters long-distance transmission, independent antenna, enhance the Bluetooth signal. 4. The product connection is simple, without any cumbersome driver and download APP, plug and play, convenient to connect to Bluetooth speakers/headphones. 5. Built-in 150mAh rechargeable battery, long battery life, supports TV transmission mode, and solves the problem that the TV cannot connect to the Bluetooth headset.Specifications:Bluetooth version: Bluetooth V5.1Working frequency band: 2.402GHz -2.480GHzInterface type: input: 3.5mm interface / output: 3.5mm interfaceBuilt-in battery: 150mAhCharging time: about 2 hoursEndurance time: RX is about 8H, TX is about 5HBluetooth distance: 10~15M (open place)Charging method: Type-c DV5VProduct list:1*Bluetooth receiver transmitter1xInstruction