Item Type: Audio AdapterMaterial: ABSBluetooth Version: 4.2Transmission Distance: >Approx. 10m / 32.8ftWorking Time: >10HBuilt-in Lithium Battery: 300mAh ( Delivered with Battery)Charging Method: Micro USBPackage List1 x Bluetooth Transmitter Receiver 2 in 11 x Power Cable1 x 3.5mm to 3.5mm Audio Cable1 x User Manual1With a 2in1 design, it can be used as a transmitter and receiver, and is widely applicable to devices with 3.5 mm auxiliary jacks. 2TX mode: Audio is transmitted from nonbluetooth devices to bluetooth headsets, etc. RX mode: transfer from mobile phones, tablets, etc. to home audio and cars. 3The signal transmission is strong, and the transmission range can up to about 10m / 32.8ft when there are no obstacles. 4Using lowlatency technology, it can provide you with perfectly synchronized stereo sound effects and bring you an excellent listening experience. 5Use a 3.5mm audio cable to connect this transceiver to your device, and you can enjoy CDlike sound effects. 6The built-in rechargeable battery can last for about 10 hours, and it supports charging and playing to ensure uninterrupted use. 7Small size and light weight make it more space-saving and portable. Although small in size, it has strong performance.