Stay aware of approaching cars with Varia RVR315 rearview radar. It pairs with your Edge bike computer or compatible smartphone to alert you of vehicles approaching from behind up to 153 yards (140 meters) away. FEATURES: Rearview radar provides awareness of vehicles approaching from behind up to 153 yards (140 meters) away, Pairs seamlessly with your Edge® bike computer and compatible smartphone as well as select Garmin wearables or the radar display unit, When used with your compatible smartphone, the Varia app provides graphics — plus tone and vibration alerts — to indicate approaching cars, When used with a compatible smartphone, Varia radar integrates with third-party apps such as Ride with GPS to overlay your maps with rearview radar alerts, Compact vertical design mounts easily to most road-use bicycles, One radar. Multiple display options. Pair it with your compatible Garmin device, your phone or both., It’s small, it’s easy to mount, and it works with just about any bike., Time spent charging is not as good as time spent riding. WHAT'S INCLUDED: RVR315, Mounting hardware (includes shims for round, aero and d-shaped seat posts), Power cable, Documentation. DETAILS: 1.8” x 2.8” x 0.8", Weight: 1.8-oz., Rechargeable lithium ion battery, Rechargeable battery life: 7 hrs., Charge time: 2 hrs., Compatible with iPhone, Android, Wireless: BLE, ANT+®, Wireless range: 20 feet, Garmin OS, Water resistant to 1M, Usage guidelines: from -4º to 122ºF, Manufacturer's 1-year limited warranty. For warranty information please click here - https://cs.kohls.com/app/answers/detail/a_id/140, Model no. 010-02252-00, Imported,. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - https://www.p65warnings.ca.gov/. Size: One Size. Color: Black. Gender: unisex. Age Group: adult. Material: NONE.