This wireless digital video monitor evaded interference, provided clearer video and audio, and achieved the longest range in tests conducted by the Hammacher Schlemmer Institute, earning The Best rating. Its digitally encrypted, 2.4GHz wireless frequency-hopping signal completely evaded interference from wireless routers and microwaves--two chief obstructions to a clear signal, so it won't pick up a neighbor's video monitor, nor they yours. It also maintained the best reception when its accompanying wireless, portable camera was moved from room to room. The monitor's 3 1/2" color display was the largest of all models tested, providing 640 x 480 resolution, and its audio performance scored highest because it was significantly clearer than other units, providing the greatest amount of volume adjustment. The Best unit also achieved the longest broadcast range, providing day and night images and audio from up to 600' away--200' further than lesser systems. Includes cables for connecting to a television or computer. A 2 1/2-hour charge of both the monitor's and camera's rechargeable batteries provides up to four hours of operation using the included AC adapters. Supports up to four cameras. Camera: 8 3/4" H x 5 3/4" W x 1 1/2" D. (3 3/4 oz.) Receiver: 6" H x 2 2/3" W x 1" D. (17 3/4 oz.)