Self Contained electronics with onboard NIMH batteries giving over 100 hours between recharge (no re-charge is needed if using a powered radio interface MM005). The headset uses a military specification noise canceling electret microphone designed for high noise environments couple with a speaker that gives excellent sound qualities. The ear defender used a twin skinned earcup, very similar to double glazed windows. Hence the earcup cuts out more noise than most other single skinned defenders on the market. Fitted with the latest liquid gel ear seals which reduce the pressure point effect from extended use also for users wearing glasses. The headset comes with individual volume control dial mounted oin the left earcup, large wind muff as standard (optional small wind muff to order) and strong PUR curly cable with 7 pin locking bayonet socket.