Fire Sentry i9040 Smoke Alarm - Micro Profile

This is a Fire Sentry i9040 smoke alarm with a micro profile design. It's battery operated and includes a 9V battery. Features include a test button, low battery indicator, and easy installation. Unopened package, but very old. Giving away two of these. You can get the other one also if you answer the other listing as well, but it's okay if you only want this one.