Specifics: Watch case diameter: 44mm Watch band width: 22mm Thickness: 13.5mm Wrist circumference: 210mm-240mm Battery type: Lithium-ion polymer battery Battery capacity: 65mAh Charging time: around 90 minutes OLED display: 96*32 Weight: 143g (5.04oz) You will receive: 1x Smart wristwatch 1x 2-pin clip charger 1x English user manual Q&A Q1. What languages does this smart watch support? A1. It syncs the languages of your mobile phone. Literally it supports all languages. Q2. Does it support IOS or Android? A2. Yes, it supports Android4.3 / iOS7.0 and above systems. Q3. Is it waterproof? A3. Yes, it is waterproof up to30-meter which is best in smart watches. You don't have to remove the watch while washing your hands or swimming. Q4. Is there any special feature for this smart watch? A4. Yes, the usage time is 8-14 days, and the standby time is more than one month which is best in smart watches. For emergency, charge for 10 minutes can give 3 days of usage. Q5. Does it have Heart Rate Monitor? A5. Sorry it does not have Heart Rate Monitor. Most Heart Rate Monitors of smart watches are inaccurate. We minus this function to increase usage time and standby time. Q6. Can I change the strap of this smart watch? A6. Yes, like the normal watches, you can change it in watch shop. Q7. Dose it supports voice function? A7. Sorry, it does not support voice.