Description: These are great helmet earphones. For motorcycle helmets， sports helmets etc.Flat headphones designed to be fitted inside most helmetsQuick release lead， headphones can be left in helmetSpeakers enclosed in removable soft padded cushions which can be stuck into helmetIn-line volume controlThe helmet speakers have a standard 3.5mm jack and will work with any MP3，GPS or music device that has this size input.If you have an MP3 attached to your motorbike， get great sound whilst you're onthe move with this pair of helmet speakers.Flat headphones designed to be fitted inside most helmets Features: Connector Type:3.5mm Stereo， 90��， Jack PlugDrive Unit Type: DynamicFrequency Response Lower Limit:20HzFrequency Response Upper Limit:20kHzImpedance:32ohmColour: BlackSound Level SPL:91dB Package includes: 1�� Motorbike Helmet Stereo Earphones1�� Extension Cable