How far away can the remote sensor be from the main receiver?
The transmission ranges listed for each instrument are the maximum open-air distances between the transmitter and receiver in a straight line, although distance and resistance should be taken into account. Subtract 25 to 30 feet for an exterior wall or any obstruction that is similar in width or composition. Subtract 15 to 20 feet per interior wall or any obstruction that is similar in width or composition. (An obstruction would include anything that is in between the line of sight like a roof, walls, ceilings, floors, trees, etc.) Also keep your units at least six feet away from other electronic appliances such as a TV, microwave, computers, refrigerator, and other radio-controlled devices.