Lux Products GEO-BL 7-Day Programmable Wi-Fi Thermostat, Works with Alexa, Geofencing Capable, Black Works with Alexa for voice control (Alexa device sold separately). Installs quickly like a standard thermostat, unique horizontal or vertical mount capability Easy set-up and programming directly from unit Free iOS or android app makes home comfort flexible and mobile App features geofencing option with easy "away" and "back" settings for added savings and comfort Three power options: battery only (2-aa lithium batteries included), micro-usb connection (cord not included) or system power (c-wire)