Refined title: Bluetooth Motorcycle Helmet with Modular Flip-up Design and Dual Visor MP3 Intercom FM Radio DOT Certified

The ILM Bluetooth Integrated Motorcycle Helmet is DOT Certified, offering motorists one-button control for answering phone calls, rejecting and last number redialing. With a mobile phone connected to this helmet, wearers can enjoy music, listen to FM radio, or receive GPS voice prompts.

This motorcycle helmet also features an intercom function, supporting 3-rider pairing and 2-rider intercom communication simultaneously, with a maximum distance of 500 meters (1,640 feet). However, it's important to note that the rider-to-rider intercom communication is only compatible among ILM 953 Bluetooth Helmets (B019PU4T7K) and ILM TCOM-SC Motorcycle Helmet Bluetooth Intercoms (B088ZQ5547), and is not compatible across other brands.

The modular helmet is designed to be slightly snug to achieve noise reduction, so it's recommended to purchase a larger size if a looser fit is desired. The ILM Bluetooth helmet with a fully charged battery can provide up to 12 hours of phone talk time, 8 hours of intercom talk time, and 110 hours of standby.

To maintain the battery's maximum working potential, it's advised to store it in a cool place and charge it regularly every month, even if the Bluetooth helmet has not been used. If the helmet's Bluetooth system hasn't been used for a long time, the battery will enter a deep sleep mode. To wake the battery up, charge it for about half an hour, after which the Bluetooth functionality will be restored.

The Bluetooth 3.0 technology in this helmet offers one-touch control for phone calls, music, FM radio, and GPS navigation audio. Incoming phone calls will override the intercom, music, and GPS navigation audio.

The intercom function allows for 3-rider pairing and 2-rider intercom communication simultaneously, with a maximum distance of 500 meters (1,640 feet). However, this rider-to-rider intercom communication is only compatible among ILM brand Bluetooth helmets, and not with other brands.

The battery set includes 1 battery and 1 USB cable. An extra battery is available in case the original one doesn't work properly. It's recommended to avoid forcibly plugging the chord completely into the charging port, leaving a little space for a better user experience.

The visor hinge is designed as a modular system, allowing the visor to be easily attached or detached for better cleaning or replacement. Users can search for B08LQ2XCGR for an anti-fog visor, or B074KZ8XH5/B074KZQFLY for replaceable clear or dark black outer visors.

The chin guard system features a release button to lift the chin guard, allowing the full-face helmet to be used as a flip-up helmet. The chin curtain is removable and provides protection from cold and wind while riding.

The top liner and ear liners are removable and washable. When changing the ear pads, users should take care as the headphones are inserted into them. Extra pairs of cheek liners/pads are recommended for a better fit.

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