The Stealth evo sets up in a flash & uses GPS technology to calculate your position quickly. NEW functions include Current Altitude Manual Start/ Stop & a Programmable Display that means that you can select the data you choose to view. After the ride upload & share data on Cat Eye Atlas Strava or Training Peaks The evo. Designed for social cycling simplicity Upper display: Current speed 0.0 (3.0)&65374;105.9km/h [0.0 (2.0)&65374;65.9 m/h] Middle display: Clock 0:00 &65374; 23:59[1:00AM &65374; 12:59PM] (Both 12 & 24-hour modes can be selected. Automatic adjustment using GPS.) Altitude -500 &12316; 9999 m [-1640 &12316; 29600 ft] Lower display: Elapsed time 0:0000" &65374; 9:5959" Trip distance 0.00 &65374; 999.99 km [mile] Trip distance 2 0.00 &65374; 999.99 km [mile] / 1000.0 &12316; 9999.9 km [mile] Average speed 0.0 &65374; 105.9 km [0.0 &65374; 65.9 mph] Maximum speed 0.0 (3.0) &65374; 105.9 km/h [0.0 (2.0) &65374; 65.9 mph] Altitude -500 &12316; 9999 m [-1640 &12316; 29600 ft] Total distance 0.0 &65374; 9999.9 / 10000 &12316; 99999 km [mile] Battery: Lithium-ion rechargeable battery Battery recharge & data communication: USB (Universal Serial Bus) Cradle Standard charging time: Approx. 5 hours (USB2.0) Standard operating time: Approx. 10 hours Recharge/discharge number of times: About 300 times (until the rated capacity drops to 70%) Control system: Microcomputer (crystal controlled oscillator) Display system: Liquid crystal display (EL backlight: Lights up constantly during the night-time) Operating temperature range: 0°F&65374;104°F (0&8451;&65374;40&8451;) (This product will not display appropriately when exceeding the operating temperature range. Slow response or black LCD at lower or higher temperature may happen respectively.) Dimension: 69.0 x 45.0 x 22.4 mm Weight: 50 grams