... network isn't available · Multi Language Support · Built-in battery backup provides approx 4 hours continuous operation · Operational built-in ... Workcode, DLST, Scheduled-bell, Self-Service Query, Automatic Status Switch, backup battery, anti-pass back. · Optional Functions: ID card, Mifare card ... , GPRS · Display: 3 inches TFT Screen · Power Supply: 12V DC, 1.5A/3A · Operating Temperature: 0°C-45°C ...