Features: Bike Computer: BT4.0 support connection with phone APP. Also supports some third party apps,like Strava and Training Peaks,easily share your rides with friends. ANT+ wireless transmission technology,easily connect with your wireless speed/cadence/heart rate sensor(not included). 2.5" display screen with backlight.Real time display helps track speed,distance,calories,date,time,and multiple datas instantly. 3 satellites positional systems ensure accurate position and trace. Built-in a 1000mAh rechargeable lithium battery,about 30 hours batter life after 3.5-hours full charged. IPX6 water resistant allows for riding in rainy days. Easy to install onto the handlebar with the provided mount and rubber bands. Mount Holder: Made of plastic material.lightweight and durable to use. Replacement for Cycplus M1,and replacement for Garmin 25/200/500/510/520/800/810. Fits bike handlebar diameter of 31.8mm(1.3"). Come with some hardware,easy to install on your bike. Specification: Model: Set A / Set B (optional) Bike Computer: Wireless: ANT+ ; BT4.0 Screen size: 2.5" Waterproof: IPX6 battery: 1* built-in 3.7v 1000mAh Working time: approx. 30 hrs Charging time: approx. 3.5hrs Size: 69*69*22mm / 2.7*2.7*0.9in Weight: approx. 68g / 2.4oz Package size: 130*93*50mm / 5.1*3.7*2.0in Package weight: approx. 200g / 7.1oz Mount Holder: Material: Plastic Fits for: Replacement for Cycplus M1 ; Replacement for Garmin 25/200/500/510/520/800/810 Fits handlebar diameter: 31.8mm / 1.3in Size: 134*55mm / 5.3*2.2in Weight: approx. 29g / 1.0oz Package size: 130*50*45mm / 5.1*2.0*1.8in Package weight: approx. 110g / 3.9oz (Set A) Package List: 1* Bike Computer 1* Plastic Mount Base 1* Type-C Charging Cable 1* Rubber Pad 3* Rubber Band 1* User Manual for Bike Computer 1* Mount Holder 2* Screw 2* Washer 1* Wrench (Set B) Package List: 1* Mount Holder 2* Screw 2* Washer 1* Wrench