Vtech Garage Door Sensor – VC7001 Relax knowing what’s going on at home. Thanks to ULE (ultra-low-energy) technology, VTech Wireless Monitoring products are easy to install and use, energy efficient, extra secure, have the longest ranges, and are super affordable. This is a ULE accessory device only, it will require registration to a compatible ULE-certified base to operate. You can program the monitoring system to alert you when your garage door is opened, or if you have forgotten to close it and you can do all this without monthly monitoring fees!