The Sennheiser SKM 100-835 G3 Handheld Transmitter is intended for use with the G3 series of wireless receivers. The transmitter features infrared-sync, for quick and easy channel syncing between the transmitter and receiver, a rugged enclosure and pristine audio reproduction of both speech and performance vocals. Two AA batteries power the transmitter, and there are contacts for recharging the optional BA2015 accupack, without having to remove it from the transmitter itself.