Description Product Description Features of the wireless transmitter and receiver : 1. Transmit frequency 2400-2480 MHz; Real digital transmit; 2. 30 selectable channels, no need to worry about signal interference. Current channel, battery level status, volume level status can be shown. 3. It can reach up to about 100 meters in an open area; 4. Shortest latency(<0.5ms) in this industry. 5. Ultra-low power consumption, more than 12 hr continuous work time for transmitter, more than 20 hr continuous work time for receiver. 6. Powered by 2 AA battery, Recharge is support if your AA battery is rechargeable; 7. Small in size, easy to install, flexible in design and support customization; 8. Audio mute when no signal or weak signal existing; 9. CE / CCC approved. Feature of the charging case: 1. Portable design 2. Durable design 3. Fire protection design 4. The case not only can be used for charging, but also can be used for carring the device. 5. A case can charge 30 devices at the same time. 6. Each charge place has a LED indicator. Specification: Carrier Frequency：2400-2483MHz Frequency Response：30Hz-18KHz  Sampling Rate: 16K@16bit*2 Number of Channels：30 Transmit Power：≤18dBm S/N Ratio：≥75dB Latency: <0.5ms Max Operating  Range：100 meters Power Supply: 2* AA battery Recharge: Support Package contains: 1* Charge Box 1*TP-WTG02(Tx) transmitter 29*TP-WTG02(Rx) Receivers 1* Headworn Microphone 29* Earphones 1* User Manual