As a bike computer, 20 Functions includes: clock/measuring current / average / , trip distance / , calories and other real-time riding data, etc. 5 Languges System: English, German, French, Spanish, and . Quickly and accurately get the data you need. Suitable for most types of bicycles.Perfect to use when hiking, climbing, riding and other outdoor actives. Features - ColorBlack - Material: Plastic, Electronic Component. - Size: About 6.5x5x1.8cm - Power supply: battery - Other Feature: Waterproof. - 20 Functions includes: clock / measuring current / average / , trip distance / , calories and other real-time riding data, etc. - Small size, light weight, waterproof design makes it convenient outdoor cycling supplies. - Applicable: Road bicycles, mountain bikes, folding bikes,and other common bicycles are compatible with this computer. Suitable for most types of bicycles. - Perfect to use when hiking, climbing, riding and other outdoor actives. - Day and Night Use: Provides backlight for easy viewing during . Perfect for daily Use. - Includes total 8 pcs item: Magnet, Probe, Base, Sponge mats, Rubber band, Tachometer, Nylon cable tie, and . - Note: Distance between Magnet and probe should be less than 3MM. Package list: 1 x Tachometer 1 x magnet 1 x Probe 1 x Base 1 x Sponge mats 1 x rubber band 1 x Nylon cable tie 1 x Instruction manual