This watch has two working mode, one is through Bluetooth and another one is network mode (sim card inserted). It enable to make call or receive call and send or get message via the sim card you inserted in it which means at this it will work like a real cell phone. You can hang out without your cell phone. Camera : 2.0m pixel, product weight : 75 (g), package weight : 235 g, appearance size : 43.5x40x9.8mm, package size : 100x100x75mm, hardware specification CPU : mtk6260a 533mhz, memory : 128m+64m, maximum support : 32GB TF card, Bluetooth : ver.3.0, battery : 380 mAh maximum capacity polymer battery, touch screen : OGS capacitive touch screen compass: support display : 1.56 inch TFT ultra HD LCD, resolution: 240x240 pixel, feature: sms: local sms; sms Bluetooth synchronization push, entertainment: mp3/mp4b local player, Bluetooth music player, call alert : ringing and vibration, alert clock display: 3 sets of clock display, free switching two way anti throw: anti throw reminder, two-way search pedometer: sports pedometer. Exercise mileage calendar: the synchronization schedule. Note : this watch is perfect on Andriod smart phones, it can also work with iPhone as a Bluetooth device, but some functions like notification push, remote capture, anti-lost are currently unavailable on apple iPhone.