Gurin High Accuracy Digital Bathroom Scale with 4.3 inch Extra Large Cool Blue Backlight Display features "Smart Step-On" Technology. One of the most advanced digital scales in the industry with 4 high precision latest generation sensors that respond accurately and consistently every time. The Gurin "Smart Step-On" technology offers instant and accurate measurements upon stepping onto the scale; no more tapping is required to turn the scale on!! Automatic turning off technology is another user-friendly design. Runs on 4 AAA batteries.