Klein Tools AESEM1S Situational Awareness Bluetooth® Earmuffs

The AESEM1S earmuffs carry a Noise Reduction Rating of 23. On top of the passive rating, high impulse, impact or constant sounds picked up by the mics are compressed down to 85 dB, and the headset's own maximum output is capped at 78 dBA, so turning the volume up does not defeat the protection. For crews running saws, hammer drills or generators, that is the usual range of jobsite hearing protection.

That is the point of the SMART SENSE situational awareness feature. Microphones on the earcups amplify low-level sounds so you can hear speech and warning signals around you, while anything loud enough to be dangerous gets compressed down to 85 dB. It means you keep the muffs on instead of pulling one cup off every time someone talks to you.

Up to 25 hours of runtime from the built-in lithium-ion battery, recharged over USB-C in roughly 2 hours. That covers a full shift with room to spare, and a lunch-break top-up puts a meaningful amount back. There are no disposable AA cells to stock for these.

Yes. The AESEM1S supports hands-free calling over Bluetooth 5.1, and the environmental noise cancelling microphones strip background noise out of the outgoing side so the person on the other end hears you rather than the compressor. Pairing range is about 32.8 feet (10 m), so you can set the phone down nearby and keep working.

Yes, and that is a real differentiator on these. Two knobs with distinct grooves set SMART SENSE ambient volume and Bluetooth audio volume independently, so you can drop the music for a conversation without losing your hearing of the environment, or vice versa. The grooves let you find the right knob by feel with gloves on.

They are built for outdoor use with 6.6-foot (2 m) drop protection and an IPX4 rating, which covers splashing water and rain from any direction but not immersion. Earcups are ABS and polycarbonate, the headband POM and TPE. Don't submerge them or pressure wash them.

The AESEM1S weighs 0.97 lbs with memory-foam ear cushions and a vented headband that reduces heat buildup in summer. Overall the set measures 7.03 x 6.18 x 3.9 inches. For all-day wear in hot conditions the vented band is the detail that matters most, since sealed headbands are where sweat and pressure complaints usually come from.

Order Klein Tools AESEM1S. It is a single configuration, no finish or size options, supplied in orange, black and grey. One model number covers the whole product, which makes it straightforward to standardize across a crew or a facility PPE program.

These use 1.26 inch (32 mm) drivers over Bluetooth 5.1, streaming from your phone rather than pulling an AM/FM signal. If you want full-range music and call audio on site, this is the type to buy. If all the crew wants is a local radio station with no phone involved, a straight AM/FM radio earmuff is the simpler choice.

No. Klein states there are no user-serviceable parts inside the AESEM1S and the enclosure should not be opened or repaired. The lithium-ion battery is internal and not a field-replaceable item, so plan on replacing the unit rather than rebuilding it.