4D Full Layout Coverage: Projects 16 green laser lines across horizontal and vertical surfaces for complete room-leveling coverage; ideal for precise construction, tiling, framing, and DIY alignment Self-Leveling System ±3°: Built-in smart self-leveling detects surface tilt and auto-adjusts for accurate leveling; ensures consistent precision with ±3mm/10m accuracy High-Visibility Green Beam: Adopts bright 4D green laser technology for superior indoor and outdoor visibility up to 20m; stable performance in strong ambient light environments Dual 2400mAh Batteries: Includes two rechargeable lithium batteries providing up to three hours of continuous work each; supports long-term use for large projects without interruption Remote Control & Mounting Kit: Comes with remote controller, magnetic rotating bracket, wall mount, lift base, 1/4 adapter, and carrying bag; versatile mounting options simplify installation on any job site