RTU5025-1 Automatic GSM Gate Door Opener with SMS Remote Control 64 authorized phone numbers can be configured 1.No call charges. the GSM Gate Opener rejects the call from authorized number then carrys out the t 2. Multiple applications. (gates, bollards, barriers, garage doors, shutters and access doors or mac 3. Secure - Using caller ID for identification,unknown callers are ignored 4. Can be operated from anywhere, no distance limit 5. Add or remove users by SMS Text command 6.Frequency range:Dual band 900/1800 MHz or 850/1900Mhz