KNOW NOW! You have many options for being notified of device activity! Receive a text, receive an email, receive a phone push notification (including Apple phone "Critical Alert" severe weather/Amber alert type notifications that will activate your phone even if in silent mode. Android phones offer similar functionality, depending on phone manufacturer). SMS messages are limited to the total of 5 times each device plus 5. A hub and two temperature/humidity sensors provides you with 20 free SMS per month. THAT WAS EASY! Be up and running quickly with our SpeakerHub hot spot mode to join your WiFi network in moments. Add devices in seconds using our Scan & Play QR code scanner in the app! Set your notification preferences, test your new sensors, then enjoy years of trouble-free operation!. TALK TO ME! Our unique SpeakerHub doesn't just play recorded messages and sounds, it tells you in clearly-spoken text-to-speech messages, AND plays attention-getting tones and sounds. You can even upload your own MP3 files, and hear your own sound effects and messages!. ECONOMICAL SMART FRIDGE! Save thousands when you make ANY fridge smart (or smarter) with YoLink smart sensors. Start with temperature sensors, then add door/lid sensors, leak sensors and a Power Fail Alarm. DON'T TRY THIS WITH WiFi! Our unique LoRa-based sensors are different from WiFi, Zigbee, Z-Wave and most other wireless smart sensors in that they are extreme long-range (up to 1/4 mile open-air), low-power (years between battery changes), and work outdoors, on other floors, and even in a metal box (like a fridge or mailbox)!.