Answer/Make Calls & Smart Notifications: Men’s smartwatch with bluetooth voice calling, built-in speaker function, free hands, you can make/answer/hang up calls directly on the smartwatch. Heart rate and sleep monitoring: Bonwe Android smartwatch supports static/dynamic heart rate monitoring, allowing you to better understand heart rate trends within 24 hours, including blood pressure and blood oxygen. The sleep monitor can record your process from light sleep/deep sleep/wake up, so that you can better understand your sleep state, arrange your rest time reasonably, and let your body get enough rest. (Note: The data is for reference only and cannot be used for medical purposes) Waterproof and DIY watch face: Full touch screen, no need to take off the watch when washing hands, sweat and rain every day. Smartwatches come with different styles of system watch faces. Also, you can set your favorite photos as watch faces. A smart watch is like your phone, you can change the wallpaper you