+33 (0) 9 81 24 00 06 contact@opus-technologies.fr


Opus Loop Rceiver Measurer is the most compact loop listening device on the market.

It allows anybody to listen to an audio frequency induction loop system just like they were wearing an hearing device switched to the “T” position.

In order to make sure your loop system is functional and respecting the IEC 60118-4 norm it is essential to use a control device. The OP-LR/M is an easy-to-use and straight forward solution to do so.

Just by turning it on, you’ll be able to control the quality of the signal received as well as making sure it respect the internatinal norm, thanks to its easy to read, led indicators.


Kit with OP-LR and OP-778


Headphones for OP-LR


Receiver/Measurer magnetic strength

Caracteristics op-lr/m


Battery type Lithium-ion battery
Autonomy 15 hours at normal listening level
Battery charging port Female Micro USB
Distortion < 0.5% THD
Output power > 200 mW into 16 Ω load
Power indicator Yellow LED: when OP-LR/M is turned on
Frequency response Flat : 100 – 8 000 Hz
Magnetic field strenght indication Yellow LED : < -3 dB
Green LED : -3 dB <x< 3 dB
Red LED : > 3 dB
Headphone output Standar stereo headphone, 3.5 mm
Dimensions 75 x 35 x 20 mm
Temperature range -10 to 45 °C
Weight 36 g, incl.battery
Finish Black ABS Plastic
Stereo headphone (included) Impedance 32 Ω per side
Headphone sensibility 102 ± 3 dB/mW
Headphone Dimensions Ø 40 mm
The OP-LR/M is CE compliant to all relevant safety an EMC standards.


Declaration of conformity