Builtin button battery, long battery lifespans Offering multiple color optional, the metal keychain is exquisitely rusts resistant. Whether it's canvas bags, sports backpacks, or workwears backpacks ​LED screen, touch the dials to switches between time, date, and stopwatches mode, with clear readings even at night. The digital display is simple and atmospheric, with a soft and not glaring white backlights. ​ It is not only a fashionable backpacks pendants, but also a practical electronic watch. The keychain design can be directly fixed on the backpacks, backpacks or keychain, allowing you to check time without taking off the watch. The 3cm dials doesnot take up much space The watch body is crafted from ABS+PCmaterial, which is resistant to falling and wear.with a silicone hanging rope that is flexible and resistant to pulling, and can maintain its appearance even in daily bumping. ​