Sensaphone (, Ashton, PA

In business since 1985, family owned.  Poor website, no prices, must call company to order.  Gateway connects to your router.  The portal is on the gateway not the cloud; no mobile device access.  Gateway issues email/text message/voice call alerts via router.  Only ag sensors are temperature and humidity.  Gateway can handle up to 30 sensors, but each group of 7 requires a "router" (repeater).  Routers are sensors set to be such and require constant power.  Uses the shorter range frequency 2.3 GHz.  Would be useful in a situation where  you have a lot of freezers/coolers in fairly small area.