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Sennheiser RR 840 Stethoset Receiver (Receiver Only) The Sennheiser RR 840 Stethoset Receiver is a reliable additional or replacement receiver for the Set 840-TV and Set 840-S listening systems. Featuring advanced RF technology, it delivers clear audio transmission even through walls, making it perfect for conferencing and collaboration environments. Key Features Compatible with Set 840-TV and Set 840-S listening systems Advanced RF technology ensures signal transmission through walls Lightweight and comfortable design with flexible earpads Large ergonomic volume control for easy adjustment Balance controls to adjust volume individually for each ear Automatic on/off function when worn or removed to preserve battery life Internal rechargeable battery with docking recharge via Set 840 transmitter Specifications Modulation FM Stereo Carrier Frequency 925.95, 926.8, 927.5 MHz Range Up to 330' (100 m) Frequency Response 50 Hz to 16 kHz Total Harmonic Distortion (THD) Max Input Sound Level (SPL) 125 dB Battery Internal rechargeable battery Approx. 9 hours operation, 3 hours charging time Dimensions (WxDxH) 9.4 x 5 x 1" (240 x 128 x 25 mm) Weight 2.4 oz (68 g) with battery