【46.48mm (1.83 inch) HD Display Smart Watch】- The 46.48mm (46.48mm (1.83 inch)-) HD display makes the display clear and true-to-life, with vivid colours ensuring smooth readability and keeping the watch as exquisite to look at as when you first lay your eyes on it. The watch has a 280 NITS Peak Brightness This fashion smart watch will work on a single charge for about 8 days (without Bluetooth calling) and about 5 Days with Bluetooth calling. Charging Specs - This men and women fashion smartwatch needs to be charged for 2 hours to reach 100%. The charger should be a 3.7V to 5V adapter or any laptop output. For a bare minimum of 20% charge the watch needs to be charged for about 30-40 mins You cannot store Music in the watch, you can only control the music. 【AI Voice Assistant】- With built-in Voice assistant, you can simply speak to the smartwatch & get things done on your command There is no volume control, however when connected to bt calling you can control the volume of the call. 【Bluetooth Calling Watch】- Fire-Boltt Ninja Call Pro Plus Smartwatch enables you to make and receive calls directly from your watch via the built-in speaker and microphone.