Electronic Earmuffs

technical data:attenuation efficiency: snr 28 dbbattery operating time: 30 hourscharging time: 3.5 hours750mah lithium-polymer (li-po) battery allows for operation even in low temperatures and is characterized by high mechanical durabilityweight: about 350 gramscharger: usbadjustable: yeslow battery indicator: yesyt-74625 active noise-cancelling earmuffs with an intelligent module that amplifies quiet ambient sounds. When working with the earmuffs on with the module turned on we hear just as we do without them. However if the ambient sound level exceeds 82 db the intelligent hearing protection will react quickly and disconnect the module for the duration of the excessive noise. Working with the earmuffs on with the module turned off guarantees a noise level reduction of 28 db.the earmuffs can be connected to some smartphones for example using the included jack cable.thanks to the built-in aux port you can listen to music in stereo and also receive the sound of the interlocutor during a phone call (the voice is transmitted through the phone's microphone).**