Welcome to our store！</br>1、850/900/1800/1900MHz four-band, can work in the global GSM network. 2、No telephone charges. When the GSM relay switch receives the call from the authorized number, the first 3、Security. Use caller ID for identification, unknown callers will be ignored. 4、Add or delete users through SMS text commands. 5、Relay action confirms the return message to the host or authorized call in the number. This function can be edited by the user. <span style="font-size:16px;font-family:Arial;">This GSM door opener has the function of remote switch. It can be operated from anywhere by authorized telephone call free of charge. There is no distance limit and it is very convenient.</span> <span style="font-size:16px;font-family:Arial;"><strong>Features:</strong></span> <ol> <li> <span style="font-size:16px;font-family:Arial;">850/900/1800/1900MHz four-band, can work in the global GSM network.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">No telephone charges. When the GSM relay switch receives the call from the authorized number, the first "ring tone" is switched on or off.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">Security. Use caller ID for identification, unknown callers will be ignored.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">Add or delete users through SMS text commands.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">There is no need to provide remote controls or keys for different users.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">Up to 200 authorized telephone numbers can be configured within a specified time.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">Relay action confirms the return message to the host or authorized call in the number. This function can be edited by the user.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">The switching time of the relay is programmable.</span> </li> <li> <span style="font-size:16px;font-family:Arial;">Multiple applications, suitable for doors, pillars, fences, garage doors, shutters and doors or machines.</span> </li> </ol> <span style="font-size:16px;font-family:Arial;"><strong>Specifications:</strong></span> <span style="font-size:16px;font-family:Arial;">Model: RTU5024</span> <span style="font-size:16px;font-family:Arial;">GSM Frequency: 850/900/1800/1900MHz</span> <span style="font-size:16px;font-family:Arial;">Digital Output: NC/Dry Contact, 3A/240VAC</span> <span style="font-size:16px;font-family:Arial;color:#E53333;">DC power supply: 9-15VDC/2A</span> <span style="font-size:16px;font-family:Arial;">Power consumption: 12V input maximum 50mA/average 25mA</span> <span style="font-size:16px;font-family:Arial;">SIM Card: Standard SIM Card</span> <span style="font-size:16px;font-family:Arial;">Antenna: 50 SMA Antenna Interface</span> <span style="font-size:16px;font-family:Arial;">Temperature range: - 20 ~ + 60 degree C</span> <span style="font-size:16px;font-family:Arial;">Humidity range: 90% relative humidity</span> <span style="font-size:16px;font-family:Arial;">Size: approx. 8.2*7.6*2.7cm/3.2*3.0*1.1in</span> <span style="font-size:16px;font-family:Arial;">Packing weight: 258g/9.1oz</span> <span style="font-size:16px;font-family:Arial;"><strong>Package list:</strong></span> <span style="font-size:16px;font-family:Arial;">1 * GSM Door Opener</span> <span style="font-size:16px;font-family:Arial;">1 * User Manual</span> Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>