Accessory Type: Battery Accessories Can only be used on 18650, not on 21700 Material: PC colour: Green Package Contents: 1 x Protection board(Due to different product batches, the appearance may vary, which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.