The first picture is a product picture, the other pictures are sample displays Description: Brand: SUNDING Colour: Black Material: ABS Use battery type: CR2032 Life time: about one month Features: wireless heart rate, wireless automatic wake-up, fat, calories, wire control button, automatic cycle and other functions Waterproof grade: life waterproof Product accessories: meter head*1 heart rate belt*1 base line control button button*1 strong magnet*1 cable tie*6 manual*1 wireless transmitter*1 Screen size: 2 inches Product size: 5.7*4.5*1.8cm Product weight: 169g Specifications: 1. Heart rate sensor: accurate data synchronization, quantitative analysis of status, and timely adjustment. 2 inch large screen: FSTN material screen, large viewing angle, more convenient to view data. 3. Waterproof protection: life is waterproof, do not soak for a long time, do not put the product in water for a long time. 4. Highlight backlight display: led backlight function, easy adjustment, clear data, safer night riding. 5. Super battery life: CR2032 button battery, with large battery capacity, super battery life about one month. Package Included: Meter head*1, heart rate belt*1, base line control button button*1, strong magnet*1, cable tie*6, manual*1, wireless transmitter*1