Wireless version: 5.3 Battery capacity: 180 mA Working range: open area up to 10 meters,without any obstaclese About charging: charging red light flash,Fully red light off Free switching: transmitter mode red light receiver mode blue light flash How To Use: Receiver Mode: 1. Long press the power button for 3 seconds to turn on; 2. Change the mode key to position RX,blue light flash; 3. Find D58 in the wireless search of your phone and chose to pair,blue light stop flash. Transmitter Mode: 1. Long press the power button for 3 seconds to turn on; 2. Change the mode key to position TX,red light flash; 3. Turn on the receiving device that needs to be paired and enter the bluetooth pairing state,the decice will automatically connect,red light stop flash. Common Faults: No sound under receiver mode: Make sure the mobiles' wireless has been connected;The speaker has been entered into AUX mode. Cannot connect under transmitter mode: 1. Make sure the device has been on transmitter mode (red light flash); 2. Wireless headset and speaker cannot be connected with the other device such as your phone; 3. Part of the wireless headsets need to initialize. Colour:Black Material:Plastic Package Contents: 1 * audio receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.