3. [screwdriver application]: It can be used to tear down doorbell for Battery , Charge & Replacement as Well as Password Reset Access. It also can be used to take apart folding knives. [Double-end Bit]: This doorbell screwdriver include a double-end screwdriver bit which can be used all R doorbells tear down. 1. [Doorbell screwdriver] : universal blue screwdriver, suitable for various types of doorbell, including video doorbell, video doorbell 2 doorbell 3 doorbell 4 doorbell Plus and Doorbell Pro & Elite, professional edition, elite edition. In short, if you lose your screwdriver, this replacement will work better . 2. [20Pcs Screws]:20pcs of 4 type doorbell replacement screws,T6 (short), T6 (long), T15 (short) and T15 (long), 5 pieces for each type. 4. [Double-headed screwdriver] : Double-headed T6 and t15 screwdriver for doorbell, double-headed dual-, easy to convert., Weight: 0.0881849048 Pounds, Manufacturer: Xptieeck