Enable to contact by radio at middle distance in "hands-free" mode with other users of earmuffs and portable radios working in the same frequency range.
Active protection function allows hearing surrounding sounds: conversation, transport noise and warning signals at safe loudness level (set up by the user).
All the settings are entered using three buttons only. Setting procedure is accompanied by electronic system voice comments enabling the user to make settings without taking the earmuffs off the head. Working on 8 channels / 121 sub-channels in PMR 446 MHz frequency band, LPD 433 MHz (69 channels / 121 sub-channels.) Ensure individual communication for several users on the same channels.
Speech microphone attached to the earmuffs has a noise compensation function and provides high-quality communication in radio frequencies (no noise transmittal). 
All settings are saved automatically after headset switching-off. At low level of battery charge a voice message "Low battery" is switched on.
Auxiliary input allows connection of a cell phone or radio communication device. Supplied with ACK081 rechargeable storage battery and FR08 charging set. 

SNR=34 H=35 M=32 L=25 *

Power source: ACK081 storage battery  (as a set) – 20 hours; or 2 AA batteries – 50 hours.
Complete set: standard headband, helmet attachments, neckband.
Range of coverage: up to 3 km.
Weight: 436 g.
TR CU 019/2011
TR CU 020/2011

* SNR – Single Number Rating, H – high frequency reduction, M – medium frequency reduction, L – low frequency reduction.