Covers an adjustable circular area of up to 1/2 acre (180' dia.). Completely portable, no wire to bury. 5 adjustable levels of correction plus beep-only model. Run through protection. Set up in 1 to 2 hours. Transmitter should be mounted inside, 2-4' above ground on a non-metal surface. Maximum range is 90' from the transmitter or 90' radius. Minimum range is 5' from transmitter. Designed not to correct during a power outage.