Title: Great idea, poor product.
Review: This unit has an effective range of 10 feet. I have replaced the batteries. I have also moved interfering RF devices such as wireless access points, cordless phones, cells. I am using this system with the original CLDM1 transmitter/receiver pair and a CLDM2 add on transmitter for a second garage door. The receiver is placed on the second floor directly above the garage doors. There is approximately 10 feet between the transmitters and the receiver, through a hard wood floor and sub-flooring. There are no large metal objects that might interfere with the communication around the transmitters or receiver. Receiver constantly looses communication with the transmitters. Great idea, poor product!
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