Requies 4XAA batteries. Verify hidden security features on banknotes and passports. Check watermarks and security strips. Check the security documents. Highlight alterations and staining. Using super Bright LEDS and bright time will last for over 100 hours. Size:6.2”LX2.2”WX0.86”H, Portable and convenient.ABS material is more durable-applicable places: Hotels, banks, supermarkets, and shopping malls.