This UV Light Keychain is incredibly useful and handy for charging glow in the dark nail polish! All our glow in the dark nail polishes can be charged using sunlight or holding them under direct light for a few minutes but the charging time can be cut to seconds with this keychain! Squeeze and hold to turn on or use the convenient switch button for no press extended activation. This switch is hard to move so we suggest using a metal nail file or similar stiff (not easily broken) object to switch on and off to protect your nails from breakage!