Why is the test button on the side of the alarm?

The test button is on the side of the device, so it does not interfere with the speaker and the sound quality of the device. Since the Onelink Safe & Sound works with the Onelink Home app, you can conveniently test via the app rather than having to press the physical test button. If needed, the product still has the physical test button on the side and is easily accessible. If an alarm sounds, evacuate the home immediately. Always ensure there is no emergency prior to silencing a nuisance alarm.