Shure SLX2/BETA 87C / S10 - SLX series handheld transmitter, cardioid condenser capsule, group/channel/battery display, frequency control from the receiver via infrared signal, 960 switchable frequencies, pilot tone, lock for menu and on/off switch, 2x 1.5V batteries, frequency range: S10 (823 - 832 MHz), up to 7 systems parallel. Please note: Due to every country having different regulations, you may need to Contact your local licensing authorities before using a wireless system.