ACCURATE DETECTION: This Johnson Laser Detector is ideal for using red beam rotary lasers outdoors; in high ambient light conditions or whenever the human eye cannot see the laser beam by quickly and accurately locating the laser signals. CLEAR DISPLAY: The red laser visibility tool has dual LCD displays ensure that your body never blocks the laser signal when operating the device and ensures you can see the reading no matter where you are. SAFETY INDICATORS: This laser detecting device features audible and visual indicators to ensure accurate leveling as well as safety. The indicators warn workers with the help of LCD/LED indictors for precise leveling. SECURE ATTACHMENT: An included clamp helps attach the laser detection device to grade rods for hand free use. This helps measure and determine the difference in elevations with ease. PRODUCT SPECIFICATIONS: This Two-Sided Red Laser Detector includes a 9V battery; and clamp.