1.The button lock is installed on the power button of the vacuum cleaner, which makes it easy and convenient to use the vacuum cleaner. You don't need to keep pressing the button when vacuuming, and your fingers no longer hurt. 2. the button head with the right index finger to operate, and the button rod at another position of the right thumb to turn it off. It is simple to operate and very convenient. 3. It is easy to install and can be completed in just a few seconds. 4. The design and color of the power button lock perfectly match the vacuum cleaner, making you feel that it is a part of the vacuum cleaner, beautiful and generous. Color: As Shown Material: plastic Package Contents: 4 * Button lock 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.