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Description: Longer wireless transmission distance The receiver comes with a wireless connection, you can synchronize enjoy your karaoke, without interference, freedom to adjust the volume Built-in over-capacity polymer battery 400Mah. A single Charge, can always use more than 12 hours, long battery life Selection of high-quality materials, micro-USB charging port Super anti-whistle features As long as there is power coupling interface or microphone audio input interface of the receiver can be inserted and KTV wireless public address functionality Widely used: Teaching, tour guide, sales promotion, lectures, meetings, karaoke, fans singing and so on Specifications: Transmitter Audio Signal: 16bit 44kHz Pairing Method: Automatcialy Frequency Range: 20-20KHZ Transmittion Method: 2.4GHZ Power Supply: Built-in Li-lon Battery Current Consumption: 0dBm<70mA Working Distance: <10meters Receiver Audio Signal: 16bit 44kHz Pairing Method: Automatcialy Frequency Range: 20-20KHZ Transmittion Method: 2.4GHZ Power Supply: Built-in Li-lon Battery Current Consumption: 0dBm<70mA Working Distance: <10meters Package Included: 1 * Transmitter 1 * Receiver 1 * 6.5mm adapter 1 * Head-mounted rack 1 * USB cable 1 * User Manual