Stageline TXS-820SX. Fixed frequency wireless beltpack transmitter with headset mic. 863.05MHz. Stageline part # 24.0940.
This headband microphone transmitter will transmit across up to 30m, with just under 5 mW of transmitting power (EIRP). The electret mic and latching device are connected to the belt pack via a 3.5mm plug, while volume control, a power LED and a belt clip make this unit even more useful. Power is supplied via 9V battery (not included).