This transmitter/receiver set packs value and performance into a compact metal case housing. The 900 MHz wireless technology will transmit crisp clear video and audio signals through the walls and between the rooms in a building. Transmitter can be set to 4 different channels allowing multiple cameras to be used with one receiver. Will not be affected by 2.4 GHz cordless phones, wireless networks or microwave ovens. 5000 feet line of sight requires the use of a high gain directional antenna. With the included antenna expect 900 to 1200 feet line of sight. Transmitting through walls, trees or other obstacles will reduce range, concrete and metal obstacles reduce performance the most.