BEC is Battery Eliminator Circuit, UBEC is a Universal Battery Eliminator circuit. There are also many other ways to incorporate a lost plane device into your plane. The easist one I know of is the "Key finder FOBs". Its two small devices that communicate when asked. Place one in yor plane (only about 9 or 10 grams) the other you can carry in your pocket. When you lose your plane in the tall grass (Or CORN) you simple press the buttom on the device in your pocket and listen for the beeping sound. Of coures you must be within 45 to 60 feet of the plane to here the beeps. Some also have flashing lights, this is good for night location. The advantage of this type of system is that they have seperate battery systems. The Alarms I've seen that work off the onboard battery are subject to loww battery power if you've been flying for awhile.

Search the internet for key finders. I have found them for around $10.00 a couple of years ago.