Apart from the above-mentioned functions, OPTA SB-031 brings you the best in class products with great quality and best value for money products.When we talk about quality we mean our products have better chipsets and more memory, better display, and a better touch screen to give you the best performance available for this segment of smart watches. At OPTA we thrive on giving our customers the best value hence we make sure we source the best products directly from the best manufacturers all around the world and have stringent quality checks. Please read the entire product details to ensure you have a satisfying experience purchasing our products. These are the techniques of the watch for your reference Specifications: *Material: Metal body shell, Edible level silicone watch strap. TPU *Heart Rate function *Sensor:Kionix kx022-1020(same as used in all leading brands) *Chipset: Nordic nRF51822 (same as used in all leading brands) *Screen: OLED 64*32 *Memory:64KB RAM + 64KB ROM *Bluetooth version: 4.0BLE(low power consumption) *Compatible : IOS 7.0+version , Android 4.3+version *Standby time: Normally use for a week,standby for 3 mouths *Incoming call alert and message alert only support Android device, don't support IOS device. *Compatible with iOS 7.0 or above: For iPhone 4S/ 5/ 5S/ 5C/ 6/ 6 plus; Android system 4.3 or above; Bluetooth version 4.0. Functions: *Step counts, distance measuring, calorie consumption management *Sleep management, event trigger (water drinking, taking medicine, meeting etc) Device does not support driving mode so we recommend not to use while driving/Riding *Call reminder, message reminder, clock, sedentary reminder *Anti-lost (positive and negative direction lookup) *Remote camera, vibration alarm clock and waterproof: Life waterproof. In all we have the best Bluetooth watch you get in this segment.