Name: Sennheiser RS 120
Brand: Sennheiser
SKU: 143RS120
Rating: 4 (35 reviews)

The RS 120 wireless headphones from Sennheiser deliver spacious, well-balanced sound with solid bass response. The included radio frequency (RF) transmitter has a maximum range of 328 feet and can send its signal through walls and ceilings. That means you'll be able to enjoy your music just about anywhere in or around your home — even outside. Plus, you can add optional headsets to share the fun with family and friends. (Add-on HDR 120 headsets available separately.)

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The transmitter doubles as a handy storage stand, and it also conveniently recharges the headset's "AAA" rechargeable batteries. The transmitter is wall-mountable, and its attached cables let you connect it to any stereo or home theater system with a standard stereo RCA output.

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Product highlights:

cushioned, on-the-ear design with open earcups and a padded, adjustable headband
900 MHz RF (radio frequency) wireless transmission
selectable 3-channel transmission
transmitter/storage stand charges the headset's battery pack
transmitter can be wall-mounted
attached input cable
includes two "AAA" NiMH rechargeable batteries
headphones include volume control, on/off switch and tuning button
frequency response 22-19,500 Hz
listening range: up to 328 feet
AC adapter
transmitter dimensions: 3-3/8"W x 8-7/8"H x 5-5/16"D
headset weight: 8.2 oz.
warranty: 2 years
MFR # 009922

What's in the box:

Sennheiser RS 120 owner's manual

HDR-45 925MHz wireless on-the-ear headset
TR120 transmitter/battery charger with 7.96' stereo RCA cables
Gold-plated 3.5mm female mini-jack to 1/4" male headphone plug adapter
Stereo female RCA to 3.5mm male mini-plug adapter
2 "AAA" Ni-MH rechargeable batteries (600 mAh)
1 UD-0902B AC adapter (output 9V DC 200mA) with 6.3' cord
EC Declaration of Conformity Sheet
Instruction Manual
"Connections of the US versions" instruction sheet
A Visual guide showing how to connect the AC adapter

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Researched by Crutchfield's Mark G.

Features & specs

General
Fit Style	On-ear
Earcup Type	---
Earcup Width x Height	3-3/16" x 4"
Noise-canceling	No
Bluetooth	No
Bluetooth Version	---
Single-earbud Operation	---
Mic For Taking Calls	No
Voice Assistant Access
Amazon Alexa	No
Google Assistant	No
Siri	No
Connectors
3.5mm	Yes
1/4"	Yes
Lightning	No
4.4mm balanced	No
XLR4 balanced	No
2.5mm	No
Other	None
Specs
Frequency Response	22-19,500 Hz
Sensitivity	106 dB
Impedance	Not Given
Weight	8.11 ounces
Cord Length	N/A
Parts Warranty	2 Years
Labor Warranty	2 Years

The Sennheiser RS 120 replaces these items:

Sennheiser RS 45

Product Research

Features
Controls
Connections
Specifications

Features

Open-Air, Supraural On-the-ear Design: Sennheiser headphones adjust to the shape of your head, with their joints, flexible materials and extendable arms. Comfortable cushions provide optimum comfort in those places where sturdy material would rest on your head.

Transmitter/Recharger: The system comes with an RF transmitter that connects to an audio source via preamp outputs. Its transmission range is from 926 to 928 MHz. It transmits a signal to the headset, using one of three selectable transmission channels. With this powerful transmitter, your crystal clear listening range is up to 328 ft. The transmitter has an automatic On/Off function. It switches on and begins transmitting when it detects an audio signal, and will switch off if it detects no audio signal for 3 minutes. The transmitter also functions as a storage stand/charger for the headset's NiMH rechargeable battery when not in use. This unit also has overcharging protection. There is a keyhole slot on the back of this transmitter for wall mounting.

Headset: The headset features cloth ear pads for listening comfort. The left ear cup has a compartment for the user replaceable rechargeable battery, and an On/Off switch. On the right ear cup, there is a tuning control for tuning the headphones to the base, and a headset volume control. The headset also has contacts that allow the battery to be recharged when the headset is placed on the transmitter/storage stand.

Rechargeable "AAA" Batteries: Power for the headset is provided by two "AAA" rechargeable batteries that fit into a compartment on the headset (supplied). The batteries in the headset are recharged whenever the headset is placed on the transmitter/storage stand. Fully charged batteries have an operating time of about 20-25 hours. The manual recommends an initial charging of 24 hours before the batteries are first used, after that the normal charging time is approximately 18 hours. Note: Only rechargeable batteries should be used.

Controls

Transmitter:

Channel Switch: allows you to select transmission channel 1, 2 or 3
On/Off: Green LED indicates whether the unit is on or not
Charge Indicator: A red LED will illuminate when the battery in the headset is being charged

Headset:

Volume Control: allows you to adjust the volume of the headset
Tuning Button: allows you to tune the headset for the clearest reception
On/Off Switch: turns the headset on or off

Connections

Transmitter:

Audio In: this cable is permanently attached to the transmitter, with stereo male RCA connectors at the other end.
DC Input: for use with supplied AC adapter

Headset: