GT21 1.75 inch HD Screen Smart Watch Bluetooth Call IP67 Waterproof Sports Bracelet GPS Fitness Tracker with Heart Rate Blood Oxygen ECG Monitoring - Pink• HD Large Screen: 1.75-inch high-resolution display, wide color gamut, clear picture quality; 6mm ultra-thin Thin middle frame, with 25D radian mineral glass cover, bring you extraordinary wear experience• Sitting Calmly, More Than One Side: Dual UI theme interaction and diversified dials, not repeated, more versatile. The wrists are varied, giving you a different freshness every day• Smart Reminder for Convenient Life: Wechat, QQ, Twitter, Facebook, and other social news push is synchronized with mobile phone in real-time, intelligent vibration reminder, avoid missing important news, convenient and fast• HD Bluetooth Calling: You can answer or make calls on the watch, communicate anytime, anywhere, and experience the convenient life brought by smart wear• Science Movement: The intelligent exercise algorithm records the number of exercise steps, calories, heart rate, and other dates for you to help you formulate a training plan that is more suitable for you• Heart Rate Monitoring: Using PPG optical heart rate detection technology, bath resting heart rate and exercise heart rate can be accurately measured to protect your physical and mental health• IP67 Professional Waterproof: Professional waterproof and dust-proof design, easy to deal with daily waterproof, no fear of daily life scenarios, such as washing hands and raining• Specifications:• CPU: GR5515• Built-in storage: RAM256KB+ROM1024KB• External flash: 64Mb• Display: 1.75-inch full circle full-color full viewing angle TFT• Resolution: 240*283• Touch Screen: Capacitive Full Touch• Bluetooth: BT5.1 and BT3.0• Heart rate sensor: support• Battery: 180mAh polymer lithium-ion battery• Bluetooth connection standby: about 30 days• Normal use: 5~7 days• Pedometer: support• Motor: support• Microphone: support• Speaker: support• Button: Power button• Charging method: charging base DC5V--150mA• Dustproof and waterproof grade: IP67• Static protection level: contact 4KV, air 8KV• 1 x Smart Watch• 1 x Cable• 1 x English and Chinese Manual• Other items not included