The Sennheiser EW 100 G4 Wireless Instrument System is perfect for singers presenters & active performers alike. The SK 100 G4 bodypack transmitter features a lightweight & visually unobtrusive design with a secure rear clip. The ME 3-II has a comfortable neckband style design with a cardioid capsule & ensures your voice is accurately captured with intelligibility & definition. The Sennheiser EW 100 G4 wireless receiver offers up to 42 M Hz tuning bandwidth within the reliable UHF range along with instant frequency allocation for up to 12 receivers & convenient synchronisation via infrared. The bodypack transmitter is powered via two included AA batteries (or an optional 2015 Accupack) & provides up to 8 hours of operation.