The Sony MDR-RF985RK Wireless Radio Frequency Headphone System is designed to transmit analog audio sources wirelessly to its headphones with a range of operation of up to 150-feet. The headphones feature a built-in rechargeable battery that can provide playback for up to 25-hours per charge. They are charged by connecting to the transmitter base station, and produce a full charge in 3.5 hours. The headphones also feature 40mm drivers and an adjustable headband designed to provide comfort for long listening sessions.
Sony MDR-RF985RK Specs
| Type | Closed, Dynamic |
| Drivers | 1.5" (40 mm ) |
| Magnet | Ferrite |
| Diaphragm | PET |
| Frequency Response | 10 Hz to 22 kHz |
| Radio Frequency | Wireless Analog 900 MHz |
| Transmitter | Channel 1: 915.5 MHz (selective, FM Stereo) Channel 2: 916.0 MHz (selective, FM Stereo) Channel 3: 916.5 MHz (selective, FM Stereo) |
| Tuning | Manual tuning via switch on both base and headphones |
| Volume Control | Rotary |
| Modes | Mute: Operates when RF signal is weak or not received |
| Inputs | Transmitter: 2x Analog RCA Phono 1x 1/8" (3.5 mm) Stereo Mini-Jack |
| Battery | Battery Type: Rechargeable Lithium-Ion Battery Charging: 3.5 Hours (Approximate) Battery Life: 25 Hours (Approximate) |
| Power Supply | Transmitter: 12 V, 200 mA AC Adapter |
| Power Requirements | DC 12 V |
| Output Power | 5 mW + 5 mW |
| Cable Length | 3.2' (1 m) (Approximate) |
| Dimensions | Transmitter: 8.5 x 4.1 x 3.7" (21.6 x 10.5 x 9.6 cm) (Approximate) |
| Weight | Headphones: 10.59 oz (300.00 g) (Approximate) Transmitter: 7.7 oz (220 g) (Approximate) |
