Brand: Smart band Model: ID107 Bluetooth version: V4.0 BLE Waterproof rating: Life-level waterproof Main chip: Nordic nRF51822 Pulse sensor: Silicon labs Si1142 G-sensor: kx022-1020 Special Features Bluetooth calling: Phone call reminder Health Tracker: Heart Rate Monitor, Pedometer, Calories Counter, Distance, Sleep Monitor Remote Control: Camera remote Other Functions: Alarm Alert, Time Clock, Anti-Lost, Phone Finder Alert type: Vibration Available colors: Black, Blue, Orange, Purple, Green Single Key: Short Click and Long Press Control Special Feature: Light on Wrist Up Data Storage: Latest 7 Days Compatible OS Android 4.4 / iOS 7.1 and above system Language Support:Chinese, (Simplified and Traditional) ,English, French, German, Italian, Russian, Spanish, Portuguese Screen Display Size: 0.49 inch Display Type: OLED Battery Battery Capacity: 60mAh Li-Poly battery Working Time: Over 7 days Charging Type: 3 Pins Clip Charger Charging Time: 1~1.5 hours Dial and Band Dial shape: Rectangular Case material: Plastic Band material: Silicone Weight and Size Dial size: 41.6 x 20 x 12.8 mm Product weight: 25 g NOTE:To ensure that the heart rate collection is correct,Please fully fit the wrist and heart rate collector,If you have questions, please contact us and we\'ll be happy to help you. Package Includes: 1* Smart Bluetooth Bracelet (with retail box) 1* USB charging cable 1* User Guide Questions & Answers : Question: How long does the battery last? Answer: It lasts 5 to 6 days after fully charged! Question: How do you get the sleep tracking to work? Answer: The sleep tracking is automatic. If you take it off at the time you go to bed, I believe it starts tracking at the point your HR slows down and your arm movement stops. Because it tracks movement during sleep as well, you may want to keep it on for better accuracy. Question: Do you have to connect it to your phone for it to work? Answer: It can work independently. Question: Can you elaborate on how it keeps track of heart rate and how heart rate is measured (does it need prompting or is it automatic)? Answer: It is automatic. Worn on the wrist, he began to work. Its use is very simple. Question: Please confirm if it work with iphone 5 Answer: Of course, it supports, please rest assured purchase.