with screen and 3 small buttons to set hours or minutes, the maximum setting time is 999 hours. The built-in battery lasts up to three years. When the lock is locked, it will not open and it is impossible to break it by hand. Please set the time reasonably. Colour:Black Material:ABS+metal Package Contents: 1X Electronic Time 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store