Volic Epic Drop-In SpeakersSend your phone's music and GPS straight into your helmet withVolic Epic Drop-In Speakers. Volic Speakers connect to any device using a standard 3.5mm headphone jack. This includes many Bluetooth communicators, so riders can upgrade their stock speakers with Volic. Large voice coils and Rare-Earth magnet drivers deliver full-range audiophile sound from punchy bass all the way up to crystal-clear treble. If your helmet has a place to mount speakers, give your ears some premium Volic sound. Includes: Speaker set 50"extension cable Extension cable clip 4 spacers (for helmets w/ deep speaker pockets) 2 speaker mounts Volic decal Features: Driver: 40mm Low-profile flat cable 3.5mm gold-plated stereo jack Simple hook & loop attachment Impedance: 8± 15% ohms Sensitivity: 130dB/m±3dB Response: 100 2KHz Voice coil diameter: 16.28mm Magnet: rare earth magnet Operating temp: 20°c +55°C Limited Warranty: (1) Year Compatibility: Any smartphone (etc) device using a 3.5mm stereo audio headphone jack Cardo Packtalk Bold CardoPacktalk Slim CardoFreecom 4 CardoFreecom 2 CardoFreecom 1 CardoQ-Solo Cardo older systems Sena 30K Sena20S Evo Sena20S Sena10S SenaSF Series SenaSMH5 Sena SMH10 (requires Sena Earbud Adapter Cable SC-A0305, sold separately) Chatterbox Duo Pro (requires Chatterbox Adapter CBDUOUHS35, sold separately) Hawk Comm X1 and X2 Schuberth SRC System for C3 Pro / E1Helmets