This is the one I have:-
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Has a long battery life when working only as an alarm, which I feel is important. Mine is on all the time I am not actually riding, and it has gone 3 weeks without a recharge!
Is a great rear light with several programs, very bright as well....
It has a remote control, with a range of an estimated 30 feet or so.
I bought a cheap programmable Remote off ebay, as I needed a second one, and cloned it from the first one and it cost me about 5 UK Pounds to buy the second remote! It is actually better made than the original!!
The rear light/alarm, sort of hides under the saddle, and unless you KNEW it was an alarm, you could never actually guess....
I hope this helps.
Andy