Monacor TXS-820 HSE, Pocket Transmitter, Suitable for the combination with all HSE headband microphones with 3-pole mini XLR plug, Transmitting power: < 5mW (EIRP), Operating range: approx. 30m, Volume control, Power LED, Belt clip, Power supply via 9V battery (not supplied), Frequency 863,05 MHz, weight 100g