Williams Sound WIR 239 - Manual (Page 22)

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WIR RX239 Receiver:
Weight: 2.2 oz (64 g) with batteries
Material and Color: ABS plastic, Black
Battery Type, Life: BAT AP97A NiMH Battery Pack, 6 hours
Modulation Frequency: 2.3 MHz
Frequency Response: 200 Hz to 8 kHz, ± 5 dB
Signal to Noise Ratio: 60 dB at 30 ft. (9m)
Controls: Volume control thumbwheel
Compatibility: Compatible with most wide-band 2.3 MHz
Transmitters
Power Switch: Built into volume control
Loop Length: 32”
Approvals: RoHS, WEEE
Warranty: 5 years*
*90 days on cords, batteries, power supply and other accessories.