Self-locking button: the power button, release your hand, and keep the button stationary (lit); the button again to display and turn off the power (the light goes out). Head type: round head Operation type: fixed self-locking Material: plastic+metal colour: As shown Package Contents: 5 x button With connector bases 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.