Retevis EHN007 Bluetooth Electronic Noise Reduction Earmuffs. Bluetooth electronic earmuff features a combination of hearing protection and amusement (built-in Bluetooth) with Bluetooth wireless technology that allows connection to external devices like phones, tablets, PC, or other Bluetooth devices, also designed with a Bluetooth indicator. Actively listens and automatically shuts off amplification when ambient sounds reached 82dB. Built-in Bluetooth and microphone, free to call and listen to music function. Designed with high-noise resistant shell and comfortable ear cups that has spacious interior space, effectively prevents low-frequency noise. With the high-density PU foam filling the interior sound block cup layer, achieving effective noise reduction. Charge indicator at the USB port indicates charging status. Earmuff is equipped with volume control button. The left and right earmuffs can be slid along the wire of the headband to adjust the height for comfortable wearing. Equipped with a storage pouch for easy carrying and storage. Electric hearing protection earmuff helps to reduce noise in the operation of lawn mower, dust collector, and electric saw, suitable for dormitory, factory, construction site, and commercial zones, providing hearing protection and a quiet and comfortable environment to you. Shooting, Hunting, Racing, Traveling, Industrial, Construction, Motorsport. 10x Bluetooth Electronic Noise Reduction Earmuffs. 10x USB Charging Cable. 10x 3.5mm Audio Cable.