Noted:If you buy (Only strap), we only ship out strap, no watch， Strap can be used on M3/M4. HIGH QUALITY: Providing a variety of useful features and services to facilitate your work and leisure activities with seamless smart machine functionality NO ANY MISSING: The tracker will vibrate when there are incoming calls or messages, you will never miss any important news, emails or Facebook messages. And you can hang up the calls with the tracker without getting your phone COMFORTABLE AND CONVENIENT: This smart sports watch is super light and comfortable, whose strap is with holes design to avoid much sweat during the exercise. And its adjustable watch strap fits to any wrist, a wonderful present for all kinds of people HEALTH MONITORING: This smart wristband can monitor your steps and distance, exercise time, blood pressure, heart rate, sleep quality at night, etc. Meanwhile, it's waterproof and anti-lost DURABLE AND EASY TO USE: Just pull out the watch chip and charge it to any USB connector about 1.5-2 hours, then it can work up to 5-7 days. Long battery life, living healthier Specifications Material: ABS+PC Strap Material: TPE Built-in Lithium Battery Capacity: 90mAh Charging Time: 2 hours Waterproof Level: IP65 Dial Thickness: 12mm Band Width: 18mm Band Length: 255mm Standby Time: About 15 days Working Time: About 3-7 Days System Requirements: Android 4.4 and above, IOS 8.0 and above, Bluetooth 4.0 support Bluetooth Chip: Bluetooth chip Heart Rate Module Operating Current: About 550uA Charging Interface: USB Sensor: Gravitational acceleration sensor Features ● HD 0.96 TFT color screen, dynamic 3D interface UI. ● Environmental protection TPE strap, sticker soliton no sense of wear. ● Always checking the number of steps walking in the day, you can also be synchronized to the APP in time, viewing and analyzing the movement data. ● The equipment automatically monitors the mileage and heat consumption of the movement. ● Long pressing to enter the health monitoring function, such as the heart rate, the blood pressure, real-time monitoring. ● A variety of motion modes monitoring (swimming, rope skipping, table tennis, tennis, etc.), pressing to enter the movement mode monitoring. ● Weather Reminder: Connecting the phone APP, it will be synchronized to the weather in phone website, then you can timely view the weather temperature and weather conditions with the bracelet. ● Languages APP supports: eNGLISH, Russian, German, Italian, Japanese, French, simplified Chinese, traditional Chinese, Portuguese, Spanish, Arabic, Korean ● Main features: Step, Mileage, Calories Consumption, Sleep Detection, Sedentary Reminder, Heart Rate Monitoring, Blood Pressure Monitoring, QQ Message Reminder, Call Reminder, SMS Reminder, Intelligent Alarm Clock, Shake and Take A Photo. "1 set watch" Packing list: Smart watch * 1PCS Band * 1pcs USB cable * 1PCS User Manual * 1PCS Original box * 1PCS "Only Strap" packing list: Band * 1pcs(no watch)