System – model: RS 120-W
Transmission frequency: 2402 to 2480 MHz
Wireless technology: Bluetooth LE Audio
Bluetooth version: Bluetooth 5.2 compliant, class 1
Modulation: GFSK
Signal-to-noise ratio: typ. 85 dB(A) at 1 Vrms
RF Output power: 10 mW (max.)
Range: up to 60 m (free line of sight)
Number of headphones that can be simultaneously con­nected to the transmitter: no limitation
Temperature range:
operation: 0 °C to +40 °C
storage: -20 °C to +60 °C
Relative humidity:
operation: 10 to 80 %, non condensing
storage: 10 to 90 %

Headphones – model: HDR 120-W
Type: on-ear
Transducer principle: open, dynamic
Frequency response: 22 Hz to 19.5 kHz
Max. SPL: max. 106 dB at 1 kHz, 1 Vrms
THD: < 0.7 % at 1 kHz, 100 dB SPL
Operating time: up to 18 hours
Charging time of recharge­able batteries: up to 8.5 hours
Power supply: 2 NiMH rechargeable batteries, AAA size, 1.2 V, 600 mAh
Magnetic field strength:
ear cups: 7 mT
headband: > 90 mT
Weight (incl. batteries): approx. 340 g
Dimensions (W x H x D): approx. 197 mm x 212 mm x 80 mm

Transmitter – model: TR 120-W
Audio connections: stereo RCA plugs
Power supply: 9 V DC-Symbol.png, 300 mA
Power consumption
operation: typ. 4 W
standby: ≤ 0.3 W (without charging)
Dimensions (W x H x D): approx. 85 mm x 221 mm x 134 mm

Power supply unit – model: NT 9-3AW
Nominal input voltage/cur­rent: 100–240 V~/100 mA
Power frequency: 50–60 Hz
Nominal output voltage: 9 V DC-Symbol.png
Nominal output current: 300 mA
Temperature range:
operation: 0 °C to +40 °C
storage: –40 °C to +85 °C
Relative humidity:
operation: 0 to 90 %, non condensing
storage: 0 to 90 %