Push switch: push the black switch to the left and right to turn on the light, easy to operate;Battery: The button battery lasts a long time and is easy to replace.If it is not bright or the brightness is not enough, it is basically caused by the battery error during the logistics and transportation process. If the contact is not bright, you can fiddle with the battery or disassemble and take out the battery and put it back in again;Removing and assembling the ring: Use the index finger to pass through the ring, and pull it outwards to disassemble it. Cannot push it left or right.