Description:Material: Plastic and metalLED display color: Green,Red,Blue,OrangeDigital: 4 DIGITPOWER SUPPLY: DC 12V-24VSquare type Backup Battery:CR1220 Battery (not included)Round type : Power cableOPERATING TEMPERATURE:-10~+65℃24 HOUR DISPLAYThis product is very convenient and easy to useDisplay: four 0.4" LED digital tubeTime setting: single button to a sliding scaleIt is widely used in equipment and Cars, boat, planes etc. It's small size and easy installation.Square type Installation dimensions: 48 * 29 * 21 mm ; Round type Size: 51x36mmSquare type Installation hole: 45.5 x 26.5 mm ;Round type Installation hole: 28mmPackage includes:Square type :1 X Car Digital Clock ;Round type :1 X Car Digital Clock