Circle Home Plus was designed with enterprising kids in mind and has an internal battery that will keep it working for 1-2 hours, even if it's unplugged. If you have push notifications turned on, you will even receive a notice when Circle runs low on battery power, or if it turns off from lack of power. If you notice that your Circle is sending notifications that it is offline or has low battery power, make sure to check that power cord! Since Circle uses a standard USB-C port, feel free to use another charger or cable with it.
Want to really make sure Circle isn't tampered with? Pair it via Ethernet and hide it away somewhere!
For more on notifications, see our "Notifications" article.