FOCUSER Electric Wireless Fence for Dogs Pet Containment System for Dog and Pets with Waterproof and Rechargeable Training Collar Receiver Boundary (with 20 Training Flags) bark spray collar 3” DMD Brightness 50 lumens 3” DMD Brightness 50 lumens Contrast Ratio 1000:1 Color ≥120% NTSC Max Resolution 854*480 (WVGA) Light life time 20000 hours Project Dimension 40 120“ Project ratio 16:9 Project distance 0 Press and hold 1 2 button until the Vibration digit on the Display flashes If your dog does not return he receives a static correction which is startling but not harmful Follow the easy instruction and training manual that is included