The Zekler Sonic 530 ear defenders, part number 380682530, provide advanced hearing protection with an SNR rating of 30 dB. Designed for demanding work environments, these ear defenders feature Bluetooth 4.2 connectivity for hands-free phone calls and music streaming. The level-dependent active listening function amplifies weak ambient sounds, such as warning signals, reversing vehicles, and conversations, while simultaneously protecting against loud impulse noises. With a long-lasting battery life of up to 55 hours on a single USB charge, the Sonic 530 ensures comfort and protection throughout extended working days. Complies with EN 352-1, EN 352-8, EN 352-4 standards.