The SPB260 is an add on Body Pack to suit the Smart Acoustic SWM260/360 Wireless System. Its poly-carbonate construction is lightweight and durable. Its belt clip allows you to securely attach your SPB260 to your belt, pocket or guitar strap. It runs on 2 x AA Batteries that are enclosed within its easy to open battery compartment. It's Infrared Pairing functionality for channel selection allows you to connect to your SWM260 quickly and efficiently. Bodypack Transmitter Gain Adjustment Range: 0/3/6dB Input Impedance: 5K? RF Power Output: 2mW/10mW/30mW Spurious Rejection: > 50dB Pilot Tone: 32.768KHz Display: LCD Power Requirement:1.5V×2(AA) Battery Life: > 8hours/ 1300mAH Dimensions:165*65*23mm Weight: 130g