1. 48K/24bit audio resolution 2. Delay time:Less than 6mS 3. Transmission distance Greater than 20m 4. Frequency response:10Hz 22KHz+-1dB 5. Distortion:Less than 0.029%(@1KHz-10dBFS) How to use? 1. Check up the battery level of the charging case/start charging 2. Charge the charging case 3. Charge other portable devices via the charging case 4. Charge the transmitter and receiver 5. Pair up all over again - double click the buttons 6. Switch the Channel banks 7. Instructions for the wireless system Wireless frequency band:5.8GHz ISM frequency band. Anti-interference method:Frequency hopping Channel bank's quantity:4 Builtin lithium battery:Over 5 hrs battery life once fully charged Battery: Rechargeable lithium battery 3.7V/500mAh Frequency response:10Hz-22KHz Wireless frequency band:5.8GHz ISM frequency band Purcahse Note: 1. This product works normally only when the transmitter and the receiver pairs up.It supports one-to-one and one-to-many. 2. Please make sure the transmitter and the receiver keep a distance away from wireless router or other wireless equipments during use. 3. A maximum of 4 sets of transmitters and receivers can be used in the same place simultaneously. 4. If the red indicator flickers during use, it indicates low battery, please charge it in time. Colour:Black Material:Plastic Size:84x100x46mm Package Contents: 1 * Guitar Transmitter 1 * Guitar Receiver 1 * Charger Case 1 * USB Cable 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.