If you're looking for a portable motion sensor then you would have several options to choose between. Portable motion sensors are easy to use and efficient. You can find portable motion sensor lights, portable motion sensor alarms as well as well as other portable motion sensor security products. A motion sensor is an efficient and practical solution to outdoor lighting. No matter whether you're looking for outdoor motion sensor lights, motion sensor security systems, or wireless motion sensor products for your home, you're sure to find something of interest. 
ElkGuard PIR-RF Motion Detector (R15), Pet Immune
"The R15 PIR motion sensor can be added to the ElkGuard Self-Contained Wireless Security System to provide protection in additional rooms. The Maximum detection range is 50ft." 
Personal Portable Motion Sensor Model PS-001
"skylink Detects movement within a 30 feet, 110 degrees radius. Provides added home security and peace of mind. Simple to install in seconds, no special tools required. For home, store, office and traveler use. Chime mode to advise occupant of entry or exit. Siren mode to alert occupant of any intruder. Can be positioned on a table or cupboard or mounted on the wall. Uses a 9 Volt battery. One Year Manufacturer Warranty. This item has many uses, being portable, wall-mountable and battery powered." These motion sensors can be found at amazon.com
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