PYRAMEX Electronic Earmuff With Blueooth Amp BT 26 Db Gray The Pyramex Electronic Earmuff with Blueooth features Amp BT 26 dB with a rubberized coating on ear cups. It is bluetooth compatible with noise suppression after 85db. It features automatic shut-off after four hours, 3.5 mm Aux jack for use of MP3 and mobile devices, and quad microphones. 2 AAA batteries are included.