Sennheiser Sennheiser HDR 120

The HDR 120 can be used as an additional headset for the Sennheiser Power for the headset is provided by two rechargeable "AAA" batteries (included) that fit into a compartment in the headset. The batteries are recharged whenever the headset is placed on the transmitter included with the RS 135-9 system. Fully charged batteries have an operating time of approximately 20 hours. The RS 135-9 system manual recommends an initial charging of 24 hours before the batteries are first used, after that the normal ...