Suitable for a wide variety of uses, such as mowing, clearing nd brushcutting. The ear protectors can be used in conjuction with a smartphone, Bluetooth 4.0 or separate AUX input. They also have a battery runtime up to 38 hours, EN 352, SNR 29. (H:33; M:26; L:18) Comes with a USB charging cable. Microphone allows for phone connection when connected to a smartphone.