The BLX1 bodypack has a lightweight and durable design. Ergonomically designed to fit comfortably in hand, with adjustable gain control. The BLX1 bodypack transmitter is included in BLX and BLX-R Analogue Wireless Systems. You will get up to 14 hours of continuous use using 2 x AA batteries (included) and an operating range of 100m. Features Power and battery status LED Adjustable gain control Quick and easy frequency matching AA batteries (included) provide up to 14 hours of continuous use 100 m (300 ft.) operating range (line of sight) Specifications Audio Input Level: Max -16 dBV maximum | Min (0 dB) +10 dBV maximum Gain Adjustment Range: 26 dB Input Impedance: 1 MO RF Transmitter Output: 10 mW, typical (varies by region) Dimensions: 4.33 in. X 2.52 in. X 0.83 in. (110 mm X 64 mm X 21 mm) H x W x D Weight: 2.6 oz. (75 g), without batteries Housing: Molded ABS Power Requirements: 2 LR6 AA batteries, 1.5 V, alkaline Battery Life: up to 14 hours (alkaline) Audio Input Level: 0dB -20 dBV maximum | -10dB -10 dBV maximum Gain Adjustment Range: 10 dB RF Transmitter Output: 10 mW, typical (varies by region) Dimensions: 8.82 in. X 2.09 in. (224 mm X 53 mm) L x Dia. Weight: 7.7 oz. (218 g) without batteries Housing: Molded ABS Power Requirements: 2 LR6 AA batteries, 1.5 V, alkaline Battery Life: up to 14 hours (alkaline) Watch: BLX Wireless System Overview