1Need to insert GSM SIM card to use 2Only one number can be bound to use. 3Can timing control socket output 4With the function of temperature control and alarming. (Users can control the device by SMS within the specified temperature range. When the temperature is beyond or below the range of values, it will stop work and send SMS alarming.) 5SMS language: Russian or English version for selectionDescription: This product is built in GSM module, controlling socket through SMS command; users can use mobile phoneto control electric appliances at any time and any place, making home appliances more intelligent. Widely applied to home, plant, library, museum, swimming pool, hotel, waiting hall and more places. Features: Need to insert GSM SIM card to use.Only support 2G network. Only one number can be bound to use. Can timing control socket output. Remotely query environment temperature.With the function of temperature control and alarming. (Users can control the device by SMS within the specified temperature range. When the temperature is beyond or below the range of values, it will stop work and send SMS alarming.) Measuring function: voltage, current, power.Can be used in mostcountries and regions, only supports GSM network standard(GSM frequency band: 900 or 1800Hz). Built-in buzzer (SMS command can be sent to turn this function on and off). SMS language: Russian or English version for selection.Specifications: Condition: 100% Material: ABS Color: White Plug Type: EU Plug Type: Russian Version Socket Input / Output Voltage Range: AC110~250V Temperature TransducerDetectRange: -10~50 Load Maximum Working Current: 10A Working Current:60MA (220V) USB Output: DC 5V Working Temperature: -20~50 Weight: approx. 182g Package Included: 1 x GSM Socket (GSM SIM card not included) Note: Can only use Unicom and mobile cards; cannot use telecom cards. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.