[PERFORMANCE] The XSound 2.1 helmet speakers offer impressive sound quality, with solid bass and clear highs that rival some of the best full-sized headphones. However, it's important to note that the maximum volume levels (98dB) of these speakers are approaching the threshold of sound that can potentially damage your ears if exposed for long periods of time, so we recommend following the optimal positioning instructions. | [OPTIMIZATION] It's important to note that the output power and quality of the device you plug the speakers into will affect the volume and overall sound quality. We recommend using a device with a high-quality output and exercising caution when adjusting the volume. Your hearing health is our top priority, and we want you to enjoy the best possible listening experience while still being mindful of your ears. | [SPEAKER KIT] Speaker placement is critical for audio quality and volume. The XSound 2.1 includes super strong 3M velcro stickers that will keep your speakers stay in place in your helmet. Align the speaker correctly and experience the ultimate audio clarity and volume. | [COMPATIBILITY] The XSound 3 helmet speaker uses a 3.5mm audio pin. Compatible with most bluetooth comms, smartphones and mp3 players. Please ensure that your device has a 3.5mm earbud jack/female plug (not compatible with all Sena Motorcycle Headsets). Helmet speakers may require volume boost app or a EAR3 helmet ampl for some smartphones, Bluetooth comms and other devices | [DIMENSIONS] Tuned 40mm drivers. Measures 1.77" (45mm) in diameter and 0.39" (10mm) thin with velcro installed Varied length Kevlar-reinforced wires stand up to 10lbs of pulling tension. Cable lengths (LEFT speaker: 40cm (15.8") RIGHT: 20cm (7.9"), with 100cm (40") extension cable. | [GUARANTEE] 30 days money back guarantee and 1 year limited manufacturer warranty.