These First Alert SMI100, Battery-Operated Smoke Alarm, 2-Pack are sold by:Amazon a seller that is based in: THE UNITED STATESThe product is made in: MEXICOMy old smoke alarms that are all interconnected/hard-wire were constantly going off, all 7 of them at the same time…so over it…Decided to try these First Alert smoke detectors that are strictly battery operated and not hardwired…I ordered a 3 pack first to see if I liked them…I liked them so much, I ordered 4 more so that now all of them are brand new and no more blasting sirens randomly in the middle of the night when I was asleep!Super easy to install, took less than 2 minutes each to pull out the old one and replace the new one.I tested them out buy using a lighter up next to one and it went off as I hoped it would!