First Alert SC5 Hardwire Smart Smoke & Carbon Monoxide Alarm

Selling 1 brand new SC5 Hardwire Smart Smoke & Carbon Monoxide Alarm. Came in a 2 pack, but I only needed one. The other is still sealed and unused in the original packaging. Works with Nest Protect. Retail price is $169 + tax. Asking $140 OBO. Serious inquiries only, please. No lowballers.