Specifications:With bluetooth-compatible 5.0 chip, the audio receiver supports A2DP/HFP/HSP/AVRCP protocols.It supports 3.5mm interface connection, which can let you enjoy stereo music.The built-in battery has large capacity to provide long working time and standby time.With built-in NFC function, it can be quickly paired.Item Name: bluetooth-compatible Audio AdapterMaterial: ABSBluetooth Version: 5.0Bluetooth Protocols: A2DP/HFP/HSP/AVRCPCharging Input: 5VBattery Capacity: 205mAh (Included)Charging Port: Micro USBRated Voltage: 4.0VTransmission Distance: 10mFeatures: Bluetooth, Stereo, Easy to CarrySize: 55mm x 25mm x 14mm/2.17" x 0.98" x 0.55" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x bluetooth-compatible Audio Adapter1 x User Manual1 x Data Cable