The Walker's Com Link with PTT is custom designed to integrate onto the Walkers Razor muffs (Muffs sold separately, will not work with Razor Quads). FeaturesWired connection for clear, stable audio 7.1mm 4-PinStandard 3.5mm plug, plug-and-playOne-touch button for quick transmissionIncludes Push-to-Talk (PTT) U94 K-Style 2-PinReduces background noise when idleClear voice pickup micPowered by 2 (AAA) batteries includedBattery Life: 12 hoursBattery - 3 'AAA'Batteries