Garmin Device and Smartphone Compatible Cycling Radar In addition to being compatible with your Edge computer, the Varia radar device can also pair up with your smartphone. The Garmin Varia smartphone app provides sound and vibration alerts, plus bold graphics to inform you of the speed and position of any vehicles that are approaching. Bike Safety Radar With Long Battery Life With its compact, vertically mounted shape, the Varia mounts easily on the seatpost of most bikes. It also has a long battery life, lasting up to 7 hours between charges. Additional Specifications: Dimensions: 40 x 72 x 20mm ANT+®: Yes BLE: Yes Water Rating: IPX7 Weight: 51g Please Note: Although this rear unit is categorised as a “rear light” on our website, it does not have a rear light beam, it is just a radar sensor only. If you would like the Garmin radar and rear light combined, please see the Garmin Varia RTL515 model on our website.