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Question: After it is " set off " , how long will it sound an alarm....and will it then reset itself ???, will it still have enough power left to sound again ?,
Document: I like this alarm because it's easy to hide in any of the bag compartments on my bike and the alarm sound is loud enough to get your attention. The only issue I have with it is how it consumes 9 volt batteries if left in the idle state. If you're considering this alarm be aware of this and bring extra 9 volt batteries with you or remember to turn off the alarm each time.The alarm is definitely worth the money and can be used for other applications as well.
It's an alarm system for $10. Of course it's not good.The bike would have to be shaken viciously for it to go off, it would not go off when someone mounted the bike and pushed it away. I tried placing it under seat, fork, and still wasnt sensitive enough.A month later, (of no use), the unit just make a constant noise and wont activate it, in the garbage.Get a real alarm system, or don't get anything.
It seems to function nicely. The instructions are on the box in Chinese and I wanted to know how long the alarm sounded if actuated and I was not close to deactivate it.I found out by looking at an earlier review that it was about a minute after which it would reset. I also would have liked a few screw hole pre-drilled into the back of the unit so I could attach it more securely and there would be less chance of it falling off while riding.
no long coment for this , just read the title up ,  is a simple battery , , it sound strong , it work in about 30 feet distance for control remoto , so nothing else , it works god
Good service promt shipping & delivery. Alarm functions very well. Very sensitive, portable easily mounted and hidden. I used industrial velcro to place and hide unit. Alarm has a good  remote key chain feature. It uses 9v battery which so far has worked well my tip and use was to shut off unit while not in use and not leave in standby mode to save battwry power. Considerably loud,as long as you consider placement so as to be heard and yet not easily seen to be shut off or disabled.
its not bad annoying like most alarms. i had to install this under the seat of my scooter, its the only place where its not so muffled. i first tried under the hood but sound a bit muffled. it works great. plus the buttons on the key chain is not so bad either. it all comes with batteries so it works pretty much out of the box. my only complaint is the shipping took like 2 weeks for me to get. very long time.
The horn is loud outdoors but not ear piercing. NOT loud enough inside a locked saddlebag5. if mounted on the outside of the motorcycle the alarm can be disabled by ripping it off a mount and then removing the battery
Pros:1. remote2. easy to useCons:1. The alarm has a VERY weak magnet2. No way to attach securely to a motorcycle3. The alarm is EXTREMely sensitivetested - indoors - on kitchen counter - slamming my hand down set the alarm offtested - indoors - in the garage. clapping my hands or snapping a thin piece of wood set the alarm offtested - outdoors - placed on motorcycle seat.
Great for a motorcycle if you want a simple alarm to add to a cover or wheel lock. It's very loud as long as you don't  lock it in a storage box where it's muffled. Better on the frame. A light tap sets it off and it is armed and unarmed with a Remote that causes the alarm to beep like a car alarm. It alarms for a minute or so and resets and another tap sets it off again.
I bought this for my trike. Since it is mid March and there is STILL snow on the ground! I haven't really got to use it much yet! but I have tested it inside. It is not overly sensitive but does sound off if someone sits on my trike or bumps into it moderately. The alarm box is about the size of a cigarette case, and the remote is the same size, look, and feel of many vehicle keyless entry fobs.
Answer: The alarm goes off for about 20 seconds and resets itself. It has the power to reset itself, but leave it on for 24 hrs (three nights) and the batteries about dead.