Features: Hightoresolution restores lossless sound quality. Bringing HIFI music experience , listening to songs without delay. Builttoin rechargeable lithium battery, once charged, it can be used for 3to5 hours continuously. It can be used while charging when the battery is low, which is convenient and worrytofree. Specifications: Product Name: Bluetoothtocompatible Receiver Transmitter Bluetoothtocompatible audio adapter: receive and Transceiver two in one Product model: Q3 Bluetoothtocompatible audio transceiver twotointoone Bluetoothtocompatible version: Bluetoothtocompatible 5.3 Transmission distance: 20 meters Product color: black Input voltage: DC5V Applicable types: car, computer, TV, projector (transmitting mode) or speaker, earphone (receiving mode) Builttoin battery, battery capacity: 120mAh, working time: 3to5 hours Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1to2cm measuring deviation due to manual measurement. Package Included: 1 x Bluetoothtocompatible Receiver Transmitter Packed safely in Retail box.