Item Type: Bluetooth TransmitterMaterial: ABSModel: C31Bluetooth Version: V5.0Power Supply Interface: Type-COutput Interface: 3.5mm AudioTransmission Distance: Approx.10m/32.8ftInput Voltage/current: DC 5V/1ABattery Type: Lithium BatteryBattery Capacity: 200mAh (Shipped with Built in Battery)Package List1 x Adapter1 x Audio Cable1 x Data Cable1 x Manual1The built in antenna enhances the signal, which can realize long distance transmission without obstacles of 10 meters. 2The signal connection is stable and smooth, allowing you to listen to songs more smoothly. 3It uses Bluetooth 5.0 chip, low power consumption and high speed, stable signal transmission. 4Support one to two function, connect two Bluetooth headsets at the same time, and have fun with your partners 5The transmitter mode will connect your TV and computer audio to your Bluetooth speakers and earphones.