Sennheiser RR800 - Additional Receiver for Set 860 and 880

The Sennheiser RR800 Receiver allows you to add an additional headset to your Sennheiser Set 860 or Set 880. Charges easily on your existing Set 860 or 880 docking station.  Please note: this headset receiver will not function without the Sennheiser Set 860 or Set 880.  What's in the Box?  Headset receiver Power supply/charging base Quick start guide Specs Type: intra-aural, closed Transducer principle: dynamic, neodymium magnets Ear pad material: silicone Frequency response: 15Hz to 16 kHz Sound pressure level: 125 dB at 1 kHz, 3% THD THD: <0.5% at 1kHz, 100 dB SPL Operating time: up to 18 hours Charging time of rechargeable battery: up to 3 hours Power supply: built-in BAP 800 lithium polymer rechargeable battery, 3.7 V, 350 mAh Weight: ~61g Dimensions: ~102 x 265 x 23mm Documentation RR 800 Quick Guide