Haven is an app that does just that. Installed on a cheap burner Android device, Haven sends notifications to your main phone in the event that your laptop has been tampered with. If you leave your laptop at home or at an office or in a hotel room, you can place your Haven phone on top of the laptop, and when Haven detects motion, light, sound or movement — essentially, anything that might be someone messing with your stuff — it logs what happened. It takes photos, records sound, even takes down changes in light or acceleration, and then sends notifications to your main phone. None of this logging is stored in the cloud, and the notifications you receive on your main phone are end-to-end encrypted over Signal.
I have been testing the beta version of Haven over the past several days and it works as advertised! I installed it on my Android burner and it sent alerts for both movement and sensing audio to my iPhone. It will even let you to access the app remotely using a Onion service address from Orbot. If you are concerned about security like I am download Haven today from Google’s Play Store. For more information on Haven visit http://havenapp.org.