***NOW as 4G/LTE version *** Our DRH-3015-V4 temperature monitor is a remote controlled temperature alarm and monitoring device consisting of a GSM module and a temperature sensor. The device has an internal temperature sensor, as well as an external, wired temperature sensor. This external sensor is waterproof and can be used in damp or aqueous environments. Example: monitoring water temperature in hot water aquariums, alarm when temperature changes in freezers, refrigerators, greenhouses, terrariums etc. With the SIM card installed, all settings of the detector can be easily changed with SMS messages. The DRH-3015 measures the ambient temperature and sends the values to a smartphone via SMS. The authorized user sets a temperature range. If the specified temperature is exceeded or below the specified temperature, an alarm SMS is automatically set. The device reacts to falling below or exceeding a set temperature range, as well as sudden temperature jumps. With the built-in voltage protection, DRH-3015 automatically sends an SMS in the event of power outages. The DRH-3015 temperature monitor is easy to set up. After inserting a SIM card and plugging it into a socket, the device is ready to use. Typical applications are home and office, server rooms etc. All functions require an existing GSM network cover and a SIM card. Note: This device is a 4G/LTE device and can be used with all European SIM cards, with 2G, 3G and 4G/LTE standard. Box contents: 1 x DRH-3015-V4, 1 x external sensor, waterproof, 1 x German manual