AKG Perception Wireless Vocal Set. 

30 Mhz selection bandwidth (depending on local frequency plans)
8 hours of operation with a single aa size battery
Gain control on handheld transmitter
Low battery indicator
Noiseless on/off/mute switch on handheld transmitter.

The Perception Wireless Vocal Set delivers brilliant sound and is surprisingly easy to use.

The SR 45 receiver provides professional XLR and ¼” jack outputs. The audio level and squelch threshold are adjustable on the receiver.

The handheld transmitter features a spring-steel wire mesh front grill to protect the dynamic transducer from the hardships of onstage use. Its cardioid polar pattern ensures maximum gain before feedback and makes your voice cut through any mix.

The system includes an SR 45 receiver, HT 45 handheld transmitter, universal power supply with US/UK/EU adapter, SA 45 stand adapter, and one AA size dry battery.