I also like the fact that I can change out their batteries when they die.

I cannot believe how accessible the batteries are to get to

Suggested, I buy stronger adhesive tape, and more batteries

Arrived with dead batteries.

Super easy to install, loud enough to be effective, the batteries have lasted three months with no signs of slowing down

My 3 yr old was able to open where the batteries are and these batteries are like the one from the watches

Both came with dead batteries.

The only think I don't like is the batteries - they are included, but these darn button batteries (four LR44G per alarm) can cost as much as the alarm unless you shop around

Good battery life.

The only thing I don't like is the batteries because they could pose a risk to small children.

Works great but one came with dead batteries

One design flaw would be the batteries

Instead, you could have something like a chirping noise when the batteries start to die, like in fire alarms

After one week the batteries were dead in one of the

Products work well but batteries were dead on arrival and replacements cost $15.

Instead, you could have something like a chirping noise when the batteries start to die, like in fire alarms

I have read reviews saying the batteries were expensive to replace

My only complaint is that the batteries are dead after 3 months

Arrived with dead batteries and no way to install them

Put brand new fresh batteries in it thinking that was the problem (thinking the factory supplied batteries were junk) but that didn't help

Very easy to install, popped a battery in, put it on the door and forgot it

batteries were dead

Opened all these up and the batteries are all dead.

They are, however, some weird button batteries,

The button to test the batteries without setting off the alarm is a very nice feature and helps offset a drawback of any battery-powered alarm -- if the batteries are dead, the alarm won't work.

One of mine had dead batteries when they arrived.

The alarms came as described, but the batteries inside were dead.

It’s loud, long battery life and easy to assemble.

So if this falls, the batteries will end up everywhere which poses a huge health hazard

One alarm came with dead batteries.

We've had this nearly a year now and no battery changes or problems.

It’s loud, long battery life and easy to assemble.

And the batteries are SUPER hard to find.

The main unit screamed and chattered away as I frantically fished around to find that part on the carpet and then matched it back up to shut it off -- at which point I had more time to pry out the batteries with a credit card

Worked as it should and everything I thought it would be

It works as it is supposed to do, sounding when the door is opened, but I can't hear it in the next room

Bought July 2014, still working as of 11 2014

Just follow the simple directions and you can set your alarm for a polite ding dong or a blaring siren that might deter a would-be robber.