Frequency - US25AC - 537,500 - 539,300 MHz. Mixed instrument/vocal wireless system from WMS40 series that is a true plug'n'play wireless solution and provides crystal clear sound. It includes the SR40 Mini DUAL stationary receiver, one PT40 Mini pocket transmitter and one HT40 handheld transmitter, and the MKG L instrument cable with mini XLR and 6.3mm jack. The receiver features three status LEDs indicating on/off status, received signal strength (RF OK) and audio clipping (AF CLIP). It provides a volume control and a noiseless on/off switch to protect the connected speakers. It integrates two separate wireless receivers in one compact and lightweight housing, featuring two balanced outputs via 6.3mm jack connector. The supplied switched mode power supply operates on any AC voltage from 110 to 240VAC and includes EU, UK, and US adaptors. The pocket transmitter features professional mini XLR audio connector which makes the body-pack compatible with all kinds of guitars, basses, instrumental pickups and headsets. It provides a gain control for perfect adjustment of the input volume and a noiseless on/off/mute switch. The handheld transmitter features a cardioid polar pattern which ensures maximum gain before feedback and the unique HDAP (High Definition Audio Performance) technology that delivers brilliant sound. It also features an on/off/mute switch and a sturdy wire-mesh cap to protect the microphone element. Both transmitters offer long battery life of 30 hours on a single AA battery.