1. Hard plastic shell with soft sponge on the inner wall to prevent foreign objects from entering
2. Prevent short circuit and prevent battery contacts from being exposed to moisture and oxidation for a long time
3. Net weight: 6 grams
4. Product size: 4.5 x 4 x 1cm
5. Note: The product includes 2 battery covers and round blank stickers, you can write the serial number with a pen as the battery number, excluding batteries and drones.