Viper - Indoor Wireless Bidirectional Siren

Perhaps it alarms using two types to "sirens". The test I did was when the "perimeter" was armed. The siren was a chirp of sorts. If this is also the case of the "fully armed" status, then I would not recommend it.

Siren was very easy to setup and is plenty loud to deter anyone entering the house if it goes off. The cats don't like it that much. It works and does exactly what it is intended to do.

I only purchased one siren for my alarm system, but I just ordered another one because the siren isn't quite loud enough to scare someone off. I will be adding one right beside the front entry so as to scare an intruder immediately upon entry. I want the neighbors to be able to hear it to attract some attention. If this is your intention then order more than one!

It is plenty loud for a inside alarm. It is very easy to set up and mount.

The rest of the home viper system is pretty awesome. I bought the siren to alert people of a break in or at least to scare off an intruder. It can barely be heard in another room. Deal breaker.