Sony MDR-RF850RK MDRRF850RK Leaflet

Mute function

Volume level decreases 

when RF signal is weak or 

not received

Headband

Wide single headband with 

self adjusting mechanism

Wearing style

Circum aural

Weight of headphones

Approx. 270 g. (incl. batt.)

Recharging time

Approx. 16 H (from 0 to full)

Supplied battery type / life

Ni-MH x 2 / 15H (when 

fully charged)

Optional battery type / life

AAA x 2 / 24H

Battery note

Rechargeable battery can 

be replaced by normal AAA 

battery (x 2)

Transmitter / Charger
Charging stand type

Standing headphone charger

Charging method

Autom. charged by placing 

headphone on the transmitter

Audio input options

Stereo mini jack / RCA - jack

Battery charge indication

Green LED on lights up 

when the battery is charged

Red LED lights up on the 

headphones and transmitter 

when the power is ON

Power ON indicator

DC 9V from the supplied 

Power source

AC adaptor

Modulation

AFM transmission system

Signal range (reception area)

Up to 100 m

Available channels

3 (for optimum signal reception)

Channel selection method

Slide witch (CH1, CH2, CH3)

Transmitting frequency

Channel 1: 863.5 MHz, 

channel 2: 864.0 MHz, 

channel 3: 864.5 MHz

Transmitter frequency range

20-15.000 Hz

Transmitter power ON/OFF

Signal transmission starts 

when audio signal is detected

Dimensions (WxHxD) in mm

133x124x136

Weight of transmitter

Approx. 195 g.

Supplied accessories

AC power adaptor (9V)

Rechargeable battery 

(Ni-MH) (BP-HP550)

Connecting cord (1m, 1 

Package

stereo mini plug <-> 2 

phone plugs)

Unimatch plug adaptor (stereo 

mini plug <-> stereo phone plug)

Style

Box

Dimensions (WxHxD in cm)

21x30x15

Package per Carton

4