GGS 3.5 inch LCD Display Digital Video Door Peephole Viewer 120 Wide Angle Auto 2.0 Mega Pixel Camera Hidden outdoor camera, 120 degree vision angle Open the power button to monitor, you could see who is outside the door at any time Auto power off after 15s , Press the power button 3s to power off 3.5 inch LCD color screen Power supply: 4pcs AAA batteries