The Wahoo ELEMNT Mini Cycling Computer is the sensor-based bike computer for those that want max data in a mini package! ELEMNT MINI is designed to work with Wahoo dual-band sensors only and offers two different configurations to meet your ride needs. ELEMNT MINI + RPM Speed: The ELEMNT MINI pairs seamlessly with the Wahoo RPM Speed Sensor included in the box, as well as other Wahoo heart rate monitors and cadence sensors. It works with our free ELEMNT Companion App that allows you to set up your data fields, customize profiles, track performance, and share ride data effortlessly - no more confusing menus! ELEMNT MINI + RPM Speed + Smartphone: When paired to your smartphone, the ELEMNT MINI gives you ride tracking, full ride data analysis, and call & text pop-up notifications. Wahoo ELEMNT Mini Cycling Computer Features Elemnt companion app set up 1.8 diagonal screen Fully customizable screen User friendly buttons Works with wahoo dual-band sensors Wahoo rpm speed sensor included Automatic workout uploads Ride tracking when paired to phone* Live track portal when paired to phone* Text & call notifications when paired to phone* *In phone mode, your smartphone must be with you on the ride and your ELEMNT MINI must be paired to the ELEMNT companion app. Wahoo ELEMNT Mini Cycling Computer Specifications Physical Dimensions: 41x58.4x17mm OR 1.6x2.3x.67 Display Size: 1.8 (45.7mm) Weight: 1.1 oz or 31 grams Battery: Coin Cell Battery Life: ~1 Year Waterproof Rating: IPX7 (waterproof up to 5 ft) Shock Proof: Yes Wahoo RPM Speed sensor included