Item Type: BT Music AdapterMaterial: ABSProduct Size: Approx. 10 x 6 x 1cm / 3.9 x 2.4 x 0.4inBattery Type: Lithium BatteryBattery Model: 4050Battery Capacity: 600mahPackage List1 x BT Music Adapter3 x Connection Cable1 x Instruction ManualManual measurement, please allow some errors.1STABLE AND FAST: The music adapter uses 5.0 Bluetooth technology to provide faster transfer rates and a more stable connection for seamless sound transfer. 2BIDIRECTIONAL TRANSMISSION: Sound can be transmitted from non Bluetooth devices to Bluetooth speakers or headphones, as well as from Bluetooth devices to non Bluetooth speakers or headphones. 3ANTI INTERFERENCE: Bluetooth adapter has strong signal reception and transmission capabilities, maintaining clear and interference free sound transmission over a stable range. 4EASY TO USE: This wireless music adapter adopts a simple plug type design, supports plug and play, no need for tedious installation steps, more convenient to use. 5COMPATIBLE DEVICES: It can be adapted to a variety of devices, such as computers, TVs, music players, etc, and realize the conversion of Bluetooth function for non Bluetooth devices.