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Amazon.com : HQRP Battery Compatible with Sennheiser RR840 / RR 840, RR840-S/RR 840 S, RS4200 / RS 4200, RI830 / RI 830, RI830-S/RI 830 S, RI900 / RI 900, RR4200 Headphones/Receiver : Digital Camera Batteries : Electronics
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Amazon.com: Accessory USA 9V AC DC Adapter for Sennheiser Set 840 Set 840S TR840 Type 15.3916 Wireless Stereo TV Headphone Listening System 9VDC Power Supply Cord (Not 13.5V) : Electronics
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Sennheiser SET840-S Wireless Assistive Listening System with Body Pack Receiver (Discontinued by Manufacturer)
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UpBright 13.5V AC/DC Adapter Compatible with Sennheiser Set 840 Set 840S TR840 900 RI900 Wireless Stereo TV Headphone Listening System 13.5VDC DC13.5V 13.5 V Power Supply Cord Charger PSU (Not 9VDC)
![Sennheiser SET840-S Wireless Assistive Listening System with Body Pack Receiver (Discontinued by Manufacturer) Sennheiser SET840-S Wireless Assistive Listening System with Body Pack Receiver (Discontinued by Manufacturer)](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/61Bv63I7u2L.jpg)