Waterproof: IP67, not recommended to use during swimming
If I do not insert SIM card, but I connect to Bluetooth with my phone. Can I make phone call or receive phone call?
Yes, but with Bluetooth connection, you can only receive messages and can not reply it.
Can i change the strap of the smart watch?
The strap can not be replaced.
Is it waterproof? Can I wear it to swim?
It is splash, sweat and rain drops resistant, however we do not recommend to take shower or swim with the watch.
For how long it can work after full charge?
Standby time is about 2-3 days, working time is about 1-2 days
Is there a camera on it?
No, there is no camera on the watch