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This rugged inmate telephone is constructed with robust stainless steel box, zinc alloy die coasting keypad, manufactured to a high standard, offering increased resistance to vandanlism to ensure the effective stable communication is maintained all time, resulting in a highly reliable product with a long MTBF. Except the normal telephone function, it can be programmble auto dial, pick up the handset auto dial the programmed numbers, if first number doesn't answer or is busy, dials next number automatically, untill it get through. speed dial and hot-line calling also can be customized.