Precise laser measure technology accurate to 1/8″; Real-time measurement mode; Backlit display offers easy & convenient viewing, even in dark areas ; Simple 1-button operation–press button once to begin measuring in real-time measurement mode, press button again to hold measurement ; Smart & convenient size & shape is easily portable & will rest on any flat surface; Fits comfortably in hand & easily in pocket ; Includes 2 AAA batteries;