Wireless handheld microphone system for karaoke, party, DJ, business meetings, speech or other outdoor & indoor activities. Adopts UHF 676MHz to 697MHz frequency band(channel A: 677MHz - 686MHz; channel B: 687MHz - 696MHz), strong anti-interference. A/D and D/A are used for high performance audio of 24Bit/48KHz; Using the ID code + frequency to encrypt the data to the frequency, which enhances the connection stability. With automatic mute and shock elimination circuit to avoid the impact and noise of the switching; extremely high pick-up sensitivity and tone quality make your speech or singing more clear. The wireless transmission distance is about 30 to 50 ; multiple devices(max. 16 sets) can be used simultaneously without interference or frequency hopping. Style: Handheld Microphone Patterns: Omnidirectional Communication: Wireless Transducer: Condenser Microphone Set Type: Single Microphone Use: Stage Performance Wireless Microphone System Frequency Response: 676-697MHz Channel Number: 10(conservative values) each time matching, ID code random change, within the frequency range set by the manufacturer Oscillator: DSP chip frequency lock Frequency Stability: +/-10ppm Distortion: less than or to 0.5% Receiver Sensitivity: -95 to 71dBm Sound Frequency: 40 - 18000Hz : or to 90dB Audio Output: 1/4 inch unbalanced output 300mV Power Supply: Built-in 1000mA Rechargeable Battery Receiver Weight: 49g / 1.7oz Transmitter RF Power: 10dBm Sound Frequency: 40 - 18000Hz Power Supply: 2 * AA Batteries (Not Included) Transmitter Weight: 203g / 7.2oz(without batteries) colour:black Material:Metal + plastic size:Transmitter Size: 23 * 4cm / 9.1 * 1.6in Receiver Size: 12.5 * 3.5 * 2cm / 4.9 * 1.4 * 0.8in Package Contents: 1* Receiver 1* Mic 1* Antenna 1* USB line 1* 3.5mm Converter 1* Users' Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.