The JBL VM-877 High Quality UHF Wireless Microphone System VM877 Frequency 200-690MHz Originalproduct informationRECEIVERFrequency range:200~690MHz Frequency stability:<10ppm Dynamic range:>105dBFrequency response:40Hz-15KHz Audio output:0-400mVSpurious suppression:>80dB Sensitivity:50dBuVReceiving distance:100M Working current:<200mAVoltage: AC100~240V,50/60Hz,10WUsing the UHF ultra-high frequency band, compared to the traditional VHF frequency band, the interference is smaller and the transmission is more reliable. The effective distance in an open environment can reach 80 meters.100 optional channels, U-band frequency modulation, supporting multiple sets of engineering use.The dynamic advanced pickup head has high sensitivity and broadband response, which can display the original timbre of male and female voices. Adopting advanced audio compression circuits effectively suppresses the generation of noise. Precision circuit design can meet normal use under harsh temperature conditions. The transmitter uses an 18650 lithium battery, with a battery life of up to 6-8 hours. Special power-saving mode to save battery power.TRANSMITTER Frequency range: 200~690MHz Number of channels:50 frequency points per channel, totaling 100 frequency points. Oscillation mode: DSP chip frequency locking. Frequency stability:10ppm RF power: 10dBm Audio frequency response: 40- 18000Hz Distortion: 0.5% Battery specification: 3.7V/18650 lithium battery 1.5V (dry cell) x2 Continuous service time: 8- 15 hours. All our items are as described in their description