The components used inside the JBL VM 900 transmitter are high quality components. The entire circuit board is a genuine standard main and 2 large wave boxes inside +2 high-end antennas. In ideal conditions without obstacles, the radius can be up to 100m JBL's transmitter has been designed with seamless 2-sided ears according to milled aluminum bars, which is very convenient for installation with professional equipment cabinets. Specifications: Number of microphone hands: 2; Antenna: 2; Battery: AA 1.5Vx2; Usage time: 8 hours; Frequency response: 80Hz-18kHz (+/- 3dB); Suitable frequency: 25MHz; Distortion Ratio: <0, 5%; Sensitivity: -107dB; Wave frequency emitted by the microphone