Wireless Bike Computer with Cadence USB Rechargeable Multi-Function High Clear Display IPX6 Bike Odometer and Speedometer Bicycle Computer Style:  With 5 Language/ With Cadence (Optional) Material: ABS+Electronic Materials Display: TN LCD / 3.0-inch Display Size / 56mm x 43mm / Black and White Screen Housing Material: PC+ABS / Black Backlight: White / 30 Hours Night Riding / White Light Transmitter: 2.4GHZ Wireless Transmission / ABS, 2.4GHZ Transmitter, 0.3mW / 1.38in x 1.65in x 0.71in Transmitter Battery: MAXELL CR2032 / 20mm x 3mm, 230mAh Main Unit Battery: Rechargeable Lithium Battery: 3.7V 120mAh 0.444Wh / 20 Hours Running Time / 2 Hours Charging Time Waterproof Rating: IPX6 Functions: Cadence, Bike1/Bike2, Clock: 12H/24H Format, Metric/Imperial Alternative, Speed comparison prompts, Stopwatch, Temperature, Scan (Automatic Circulation), Current speed, AVG speed, MAX SPEED, TRIP TIME, Total Trip time, ODO METER, LED BACKLIGHT, AUTOMATIC START-STOR FUNCTION, Auto ON/OFF Dimensions: 76 x 51 x 19mm / 2.95 x 2.01 x 0.75in Weight: 100g / 3.53oz Gross Weight: 110g / 3.88oz