2 In 1 Bluetooth 5.3 USB Transmitter Receiver Audio Adapter 3.5mm Aux. Airplane Product Features: One key subwoofer equipped, breaking the existing products of the same type. Two-in-one design, transmitter, receiver all-in-one machine. Support simultaneous connection of dual headphone devices, the latest design, the same type of leading products. Hidden AUX cable design, convenient and simple. Automatic back to connect, one of the superior products of the same type at present. Built-in battery design, lasting life. Digital display of power level, always master. Support hands-free call function. Equipped with the latest chip, 5.3 Bluetooth version configuration, fast operation, no lag. Enhance all kinds of audio, computer, TV, car, CD player and other devices without Bluetooth function. Specification: Battery capacity: 240mAh Bluetooth version: v5.3 Working hours: RX13H / TX17H Operating Current: 20mA Charging time: 2H Bluetooth transmission distance: 10m Bluetooth sound processing: with DSP technology and A2DP Working hours: about 17 hours [support while charging, while using]. Product size: 55*43.3*13mm Product list: Bluetooth adapter *1 Instruction manual *1