Batteries: 2x AA, 4-6 hours
Audio power: 100 mW @ 32 Ohms
RF power: 10/30 mW, switchable
Freq. groups: 516-558 MHz (A), 566-608 MHz (G), 626-668 MHz (B)
Freq. groups: TV 21-28 (A), TV 30-36 (G), TV 40-46 (B)
Freq. response: 25-18,000 Hz
Max units/group: 16
Features: Auto-Scan, Auto Lock, 5-band GEQ, diversity receiver, HF boost, IR sync, WMS PC network control
http://www.sennheiserusa.com