Model: DM18 - Compatible with all platforms and suited for men, women, businesspersons, teens, couples, and stylish adults, this device has a 1.85" TFT IPS full touch color screen. With 64MB of body memory, an intuitive USB 2.0 interface, and a wristband for comfortable wear, it boasts exciting features like step counting, smart reminder, remote selfie, health monitoring & more. Plus, this watch has a 10m wireless distance, a 190MAH battery, a sleek 44.7X 37.7X 8.9 mm size, a stunning 240X280 resolution, and a silicone strap. There's no invoice, but the package includes the device, manual, and charging cable. Plus, it's waterproof, takes pictures, measures blood pressure & oxygen, and has a 7-14 day battery life!