Features: 1, Fast, accurate and reliable 2, Rechargeable battery 3, Light and practical, easy to carry 4, Operation modes: Self-leveling Mode,Manual Mode,Pulse Mode 5, It can be used for Door & window installation, Hanging decoration, Woodworking decoration, Wall construction etc. Warning: Avoid direct exposure of the laser beam to the eyes. Specifications Item Model:SW-331G Product Type:2 Lines Laser level Laser Type:LD Green 520nm Laser Class:Class II Laser Power:15mW×1 Charge Mode:USB-C Charging Socket Storage Temperature:-10°C~50°C Material:ABS Plastic Type:Vertical & Horizontal Lasers Accuracy:±3mm/10m Levelling Range:4°±1° Levelling Time:≤3s Extension Angle:H&V: 110° Ingress Protection:IP54 Power Source:3.7V 1400mAh Li-ion Operation Temperature:-10°C~50°C Product Weight:241g Size:75x64x77mm Operation Modes: Self-Leveling Mode: 1.It is enabled when the laser tool is switched to the Unlocked Position. Manual Mode: 1.It is enabled when the pendulum lock is in the Locked Position. 2.Laser beam will flash every 5 seconds. Pulse Mode: 1.It is activated by a press and hold ≥ 2 seconds when laser tool is in the Unlocked Position. 2.Beams will lower the brightness and Pulse LED indicator will turn on.