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SCREEN AND WATERPROOF: 2.5 inch big display area screen;white color backlight;good display effect under the sun. Waterproof grade: IPX5. IML MIRROR SCREEN: Large-size abrasion resistant ILM mirror screen, clear and transparent, looks cool, more practical. ANT+ & Bluetooth Use BT4.0/ANT+ dual model technology, wireless connect with Speed/Cadence sensor. Package include a speed/cadence sensor. Pairs with most sensors: Support external heart rate monitor, power meter, speed/ cadence sensor. Help you master training data, more scientific training. Please note: M4 not support 5.3kHZ heart rate monitor. MORE DATA Cycling history record view, Can show 15pcs main cycling data. DURABLE BATTERY can use 120hours without backlight; You need to pair with the sensor before use. 1, Press"setting" button enter into setting mode, then set time, date, ODO. 2, Whenthe icons are flashing, it means the device started to pair, when the icons notflashing, it means the devices paired successful. 3, Attentionplease:If Speed&Cadenceicons continue flashing on this page, please rotate the crankarm, till pairsuccessful. 4, After pair the Speed&Cadencesensor, you can see the Speed&Cadence data change on computer when rotatethe crankarm. Package Include: M4 Bicycle computer x 1 Charge Cable x 1 Front knob holder x 1 User Manual x 1 Front stand holder x 1 Belts x 6 Wireless speed/ cadence sensor C3 x 1 Wheel magnet x 1 Pedal magnet x 1Not include: Heart rate monitor, power meter