can we add wifi siren to ST?
there are no wifi sirens I know of that work with SmartThings. Only z-wave.
i am able to pair but showing tile missing
make and model?
CYBERNOVA Smart Home Series-WiFi Wireless USB …shall i connect directly to USB port?
yeah, i’ve never seen that device working on smartthings. Doesn’t mean it isn’t possible, but you’re have to do some Googling.
any zigbee sirens out there that work for smartthings?
I think the new Iris keypad is zigbee and has a siren in it and Rboy has a handler for it.
Does that device have an ifttt capability?
Cyber nova is a rebrand of another device. It works with the SmartLife app, so you should be able to use IFTTT just to turn it on and off. That give you some smartthings integration. But it’s a very cheap device and gets terrible reviews, so it wouldn’t make my candidate list. 
Other WiFi sirens
I like the D-Link Wi-Fi siren if you’re going to use IFTTT for the integration because it lets you select a sound as well as just turn the sirens on. But it’s been discontinued, so you can only find it used now. But if you’re looking for a very cheap choice, personally I would rather get a used dlink than a new cybernova.
Note, however, that you can’t turn it off through IFTTT. 
but it’s a plug-in, so you can plug it into a smart pocket socket if you want.
Zwave sirens
There are six sirens on the official US compatibility list, but they are all zwave.
Lots of choices there, though, for various features, including strobe.
@krlaframboise has done a lot of work with these devices, and might have more to say.
Zigbee sirens
Smartenit has a nice $60 ZHA zigbee siren which should work with smartthings, but someone will probably have to write a device handler for it:
There’s a zigbee siren which works with both cox and infinity which you can sometimes find and works out of the box with smartthings as an on/off switch. Price varies like crazy because you’re always buying from a third-party if you aren’t a service subscriber.
Herman makes a ZHA siren which will probably work out of the box as an on/off switch, but would need a custom handler to get control of the strobe and other features.
http://www.heimantech.com/product/153.html
So there are some choices. In general, a zigbee siren using the ZHA profile will pair as an on/off switch. But will need custom code to get to any of the other features.
Summary
If you don’t care about the protocol, just pick one of the zwave sirens off of the official “works with smartthings“ list. They’re all good. They vary in features and price, so just look for the one that best matches your needs.
If you’re in the US, the zooz zwave siren is usually just under $30 and is also worth looking at.
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