[Performance] The XSound 2.1R helmet speakers offer amazing 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 (max 124dB) of these speakers are the loudest we have ever made. Use with caution! | [Music Source] Output power and quality of the device you plug the speakers into will affect the volume and overall sound quality. Use a device with a high-quality output and be careful when adjusting the XSound 2.1R with the added extra volume. | [XSound Kit] Proper speaker placement is crucial for optimal audio quality and volume. The XSound 2.1 comes with 3M velcro stickers to keep your speakers securely in place inside your helmet. Correctly align the speakers to elevate your helmet audio experience. For the best results, position the speakers as close to your ears as possible and use the included foam spacers to achieve the ideal fit. | [Connect With] The XSound 2.1R 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). Pending on audio source level, helmet speakers may require volume boost app or a EAR3 helmet amp 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: 19.29" (49cm) RIGHT speaker: 11.41" (29cm), with 40" (100cm) extension cable.