MicrocKing Wireless Microphone System, with 4 Handheld Mics, Metal Build, Fixed Frequency, Long Range 400ft, Ideal for Party/Wedding/Church/Conference/Speech

PRODUCT SPECIFICATION RF Frequency Range：500MHz Working Range：40m(approximately 150ft)under typical conditions Audio Frequency Response：50to18,000Hz-3dB Audio Output Level(-20khz deviation, 1 KHZ tone)：1/4-inch connector(into 3k load): -8. 8dbv(Hi Z),XLR connector RF Sensitivity：85dbm, typical System Distortion(ef15 deaton, 1 KHZ modulation：0. 4% Current Drain: Transmitter: 50MA average(70MA max) Receiver: 100MA average(130mamax) Operating Temperature Range: -20 to 50 (-4"to 122 F ). Matters Needing Attention 1. You will need an extra audio equipment like speaker to connect with this product to make the sound working. 2. Please keep the receiver away from the metal or any digital devices (such as computers, cellphones, etc. ) to avoid potential sources of interference. 3. The receiver should be more than 1m from the ground. Please avoid to be against a wall. 4. Please do not use the microphone facing the receiver too closely, in order to avoid noise interference. 5. Please do not flap the microphone head with hand, or it would be damaged.