Based on the H10-13.4, David Clark’s Electronic Noise Cancelling (ENC) headset offers extra noise reduction courtesy of some advanced electronic circuitry.Available in several versions, the most popular are the H10- 13X, which has an inline battery box for 6 x AA batteries, and the H10-13XL which has a modular connection system, allowing the use of different configurations for different aircraft. It is even possible to purchase additional cables to allow use in both fixed-wing (dual plug) and rotary wing (4-way U-174 “US-NATO” plug) operations.• ENC noise reduction system• Soft headpad and gel ear seals• Hinged/flexible mic boom with M-7a electret microphone• Dual volume controls• Choice of battery or panel-mount power module (-XL model only)• Detachable cable (-XL model only)Weight 510g.