Press the 2 keys on the back of the dash clock to set time and date. see the specific procedures in the description or product imageThe small digital clock is designed exquisitely and it is durable.Automotive electronic digital display clocks. 12 hours System.The mini clock can display the time and date. Time displays hour and minute.You can put it on your desktop, or use the included double-sided adhesive tape to stick it on where you want to use. [Please refer to the image for comprehensive instruction] Product Description Instruction Press top-button or bottom-button, it displays "month" and "day". Press bottom-button twice to display "month", then press top-button to set "month". Press bottom-button three times to display "day”, then press top-button to set "day”. Press bottom-button four times to display "hour", then press top-button to set "hour". Press bottom-button five times to display "minute", then press top-button to set "minute". Press top-button once to display "month" and "day", three seconds later, return to normal time. Press top-button twice to display "seconds", then press bottom-button to return to zero. Specifications: Material: PVC Power: 1Pc x AG10 button cell battery (included) Size:6.3cm/2.48inch x 3.4cm/1.34inch x 1.4cm/0.55inch. LCD display Size:5.6cm/2.20inch x 3.2cm/1.26inch x 1.1cm/0.43inch.