A built-in low-battery warning will sound before power is depleted.
: Compatible with two-way radios and telephones for full duplex communication. Peltor Select™ II peltor select 2 manual
: It "listens" to ambient noise and uses an electronic "vent" to attenuate loud impulse sounds (like gunshots) to safe levels. Stereo Sound A built-in low-battery warning will sound before power
If the PDF is 404-ing on 3M's site, use web.archive.org to go back to Peltor’s 2012-era support page. peltor select 2 manual