TIPS: 1. Calibration is necessary before using the stud finder function. 2. Laser level is manual-leveling, not self-leveling, please use the two bubble vials for accurate horizontal, vertical and cross lines. 3. Two bubble vials only work and light up when the Laser Mode is active, not in the detection mode. 4. Self-adhesive strips are not suitable for dusty, coarse surfaces, wallpaper, or drywalls, etc. Replace the strips if they are dirty or not sticky. 5. Class II laser safety product, output < 1mW. 6. Note: NOT designed for use on LATH and PLASTER WALLS. Works best on DRYWALL and WOOD WALLS One Tool for Two Jobs: This multifunctional tool combines a rechargeable stud finder and line laser level, offering two essential functions in one compact device. PACKAGE:1 × Rechargeable PREXISO 2-in-1 Stud Finder with Laser Level, 1 × Type-C Charging Cable, 1 × 360° Wall Mount with 2 Pins, 6 × Self-Adhesive Strips, 1 × Portable Storage Bag and 1 × User Manual Easy & Automatic Edge Marking: In the Stud Finder Mode, the device will auto-project the upper vertical laser line when the stud edge is found. At the same time, the top LED lights turn red and an audio alert sounds, providing visual and audible guidance for easy and precise edge marking. Repeat the same actions from the left or right side to get the exact location of the stud Multi-Surface Laser Level: It's a manual-leveling laser level, not self-leveling. The two lighted bubble vials help you manually align horizontal, vertical or cross-lines only when the backside of the device is flat against the wall or floor, and the bubbles are centered. And LED bubble vials provide additional visibility in dark areas and enable a 180° visual reference. Laser working range typically up to 10m/30ft (indoor use) Three Fixing Methods for Multi-Surfaces: The 360° rotating wall mount offers flexible positioning and hands-free marking. Three Fixing Methods: 2 pins for rough surfaces; 6 self-adhesive strips for smooth surfaces (not suitable for dusty, coarse, wallpapered, or drywall surfaces); top pin hole for hard surfaces and other general use Stud Finder with Wood & Metal & AC Wire Detection: Accurately detects wood and metal studs up to 3/4 inch deep through drywall and AC wires up to 1-1/2 inch. It alerts you to the presence of live AC wires and keeps you safe from electrical hazards. When the stud edge is found, the upper vertical laser line is auto-projected, the top LED lights turn red, and an audio alert sounds, easy for edge marking. Repeat the same detection actions from the left or right side to find the exact location of the stud Muti-Fuction & Wide Use: PREXISO 2-in-1 Stud Finder with Laser Level is a versatile and reliable tool that can make construction and decoration jobs more efficient, and an ideal tool for DIYers, decorators, perfect for various indoor tasks like hanging pictures, mounting shelves, installing frames, locating wood and metal studs, and live AC wires. It's also a great gift for handy friends or family on special days