Sennheiser RR840 Stereo Stethoset Receiver for Set 840-TV & Set 840-S, 50Hz-16kHz Frequency Response Extra Headset (RR840 Stethoset Receiver) for SENNHEISER SET 840-S/-TV listening system (Not a complete system) Purchase includes: Headset RR840, rechargeable BA300 battery (installed), 3 pairs various ear tips and instruction manual (Transmitter is Not included)