... lock system 3. free software 4. for hotel,apartment,office security electric door lock for hotel, flat and office Main Advantages:( ... than 500000 timesTechnology Parameters: ItemsParametersProduct Dimension245L*76W*20H(mm)Door Thickness38~60mmWeight 2.8kgUsing VoltageDC 6V, 4 Alkaline BatteriesStatic ... after the deposit Certificates Programs security electric door lock for hotel, flat and office