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When?

At least after five years, OR
If the siren has been sounding over 15 minutes,   OR
The siren is sounding, and you don't know for how long
Sonic Shock alarms are typically installed in commercial sites, and thus are designed to run years without battery changes. By design they do not sound a "low battery" chirp.

With what?

Any 9 volt Alkaline battery  OR

Any 9 volt Lithium non-rechargeable battery

Weatherproof versions should use the Lithium non-rechargeable battery.

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We make small LOUD anti-theft alarms that thwart, frustrate, and stop theft of TV's / televisions, projectors and PCs / computers / iMacs. Deployed by commercial users world wide – universities, colleges, hospitals, restaurants, hotels, business centers, and community centers. Sonic Shock anti-theft alarms are not only proven more effective than locks, cables, or tie downs, they also spare your site from unsightly cables, locks, or chains that tell your customers both that you don't trust them, and that your site is potentially unsafe.