Elertus can protect your wines and valuables!This wireless-smart-sensor triggers alerts, text messages or emails to your phone, tablet or pc. Elertus notifies you the instant an important door, drawer or cabinet is opened/closed, if a light is turned on or off, if temperature or humidity hit critical high or low levels or if the sensor is moved in any way. Check-in on your sensor from anywhere.. anytime! Features and Alerts • 100% wireless, place it anywhere (battery powered) • No monthly fees or subscriptions! • free alerts and notifications! • free mobile app (iphone, android, windows) • humidity levels (0 - 100%) • monitors temperature (-20 to 150°F) • light sensor (on/off) • doors, drawers, safes, lids (open/close) • vibration/tampering (accelerometer) • battery level • lost connection (wifi) • alert multiple contacts (up to 5) • enable/disable specific alerts • and much more! Specifications Internet: Connects to the internet via wifi Power Source: Two (2) AA alkaline batteries Power Useage: 1 year battery life with typical usage Temperature Sensor: Range -20 to 150 F Humidity Sensor: 0% to 100% (Non-condensing) Dimensions: 3.1" x 2.6" x 1.05" (78.7mm x 65.7mm x 26.6mm) Free Mobile App: iPhone, Android, Windows (+ receive text alerts on any phone) Included: Velcro backing, wall mounting screws (optional), door contact switch, micro door switch (for small boxes, lids, humidors) , two (2) AA alkaline batteries, setup guide. Support: Unlimited phone and email support. Made In America