Specifications: Operating Frequency: T24 (169.505 MHz & 170.305 MHz) Number of Channels: 2 Modulation Mode: FM RECEIVER Reception System: FM Superheterodyne Reception Sensitivity: 2 µV for 30 dB S/N DC Input: 9V DC (center-positive) Battery: 9V alkaline (not included) Current Consumption: 50 mA Battery Life: 8 hours normnal Dimensions: 4.09" x 2.44" x 0.94" BODY-PACK TRANSMITTER Modulation: FM Modulation Sensitivity: 6 mV for full deviation Battery: 9V alkaline (not included) Current Consumption: 50 mA Battery Life: 8 hours normnal Dimensions: 4.09" x 2.44" x 0.94" Features: Includes ATR35 miniature lavalier condenser microphone for "hands-free" uses such as aerobics, dance, theater, lectures and "newscaster-style" videos Includes ATR20 dynamic microphone for handheld uses such as singing, talking, recording and videos Compact, ultra...