Features: Brand new and high quality Real machine mold opening design, for mini battery side cover can be directly replaced Silicone dustproof and waterproof plug to effectively prevent dust and rain splashing Aviation grade aluminum is refined into a lightweight hollow design, which is strong and durable, and the overall weight of the accessories is only 2.7g. The aluminum alloy hole design does not need to open the whole battery cover. It can be charged by opening the silicone plug. Charging while riding, the card will not enter the dust, and the battery life effect is full. Specifications: Material: Aluminum alloy+Silicone Color: Black Weight: 2.7g Size:Approx.28x18x8mm/1.1x0.7x0.31inches Package Includes: 1x Battery Cover note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.