Oricom! I love ours, 3 yrs old and still going strong. No interference and has really good range
We bought this one for Mums house - the Oricom SC50 from Toys R Us on sale for $50 from about $100. Its awesome, Mum can be down the back of the yard gardening the range is good, no interference either. (no Sensor pads, just a straight forward nursery unit and receiver)