The same notification can also be sent to specified email account.
So, if anything goes wrong, we can respond in short time. 4. Long lasting battery We don't need to keep the watch running all the time. It should be "wake up" instantly when making payment, and then go to sleep again. So, we may only need to run it for a few minutes a day, which means, it can last for months in one charge! When the battery needs recharge, we will get notification. 5. Remote control / No keyboard. We should not be able to enter any text on the watch. So, all configuration is done through computer or smart phone remotely. That's one of the major differences between Watch and Phone. 6. Tough No dust, no water, no shock, and works well in extreme temperature. 7. Enclosed environment This watch is critical to user's daily life, so, security gets highest priority. To minimize risk, it should not allow any third-party software. 8. Date / Clock Only provide basic information. 9. GPS and Emergency report No map needed, but it's nice to know that you can always get help, anywhere, anytime. 10. Privacy OK, this is the inevitable drawback of this watch. But, as it doesn't collect information more than current mobiles, I assume it's fine. How much I am happy to pay for this kind of watch? $200 is fine. But, I think, Google may be happy to give people for free, as exchange of their personal information.