The Stealth 50 is a simple power meter that is ANT+ compatible so it works with third party power heart rate & cadence sensors. Track basic cycling data & combine with power heart rate & cadence data to target & reach training goals. Upload ride data to web-based training sites such as Cat Eye Atlas.com Strava & Training Peaks where you can visualize your activity analyze performance & share your ride. Other features include a full-time backlight auto-stop/start & programmable odometer. The Stealth 50 is waterproof USB (Universal Serial Bus) rechargeable & can be used on multiple bikes so you&8217;ll always be ready to ride. 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.) Power (&8251;1) 0 &12316; 9999 watt Lower display: Elapsed time 0:0000" &65374; 9:5959" Heart Rate (&8251;1) 0 (30) &12316; 199bpm Cadence (&8251;1) 0 (20) &12316; 199rpm 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] Total distance 0.0 &65374; 9999.9 / 10000 &12316; 99999 km[mile] Date 1.1 &12316; 12.31 (Automatic adjustment using GPS) Battery: Lithium-ion rechargeable battery Battery recharge & data communication: Mini USB (Universal Serial Bus) plug 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) Sensor signal transmission system: ANT+ Operating temperature range: 0&8451;&65374;40&8451; (0°F&65374;104°F) (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: 60 grams