Monitor and record temperature, power, and humidity all without the use of on-site phone or internet connection. Receive custom phone calls and text alerts or emails when conditions are out of safe ranges. Go online to view real-time conditions, download history and manage settings. Comes fully operational with a 4G AT&T cellular connection. Data plans are $14.95 per month when paid annually or $24.95 per month (month to month). Sign up for service when device arrives to you! Includes battery backup to send notifications even during power outages. MarCELL PRO is a simple, cost effective, cellular connected data logger and remote notification device. Enhanced features included in MarCELL PRO bundle include: Improved frequency of temperature and humidity logging (every 30 minutes) Includes 20 monthly "real time" updates to view up-to-the-minute conditions on demand Unlimited online storage of historical data readings. Ability to create "read only" users for guest access into online portal. Dashboard view allows for easy monitoring of multiple units Protect your property from freezing pipes, temperature or humidity swings ruining plants or endangering animals! Monitor facility conditions 24/7 and be alerted to potential issues remotely! Subscription costs ($14.95 per month - billed annually) includes all online hosting, cellular connection fees, and unlimited text, phone and email alerts. Designed and manufactured in USA.