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Telephone dialer automatic calling unit for call through service -TD101 Line power, no need extra power supply. Great capacity: TD101 can store up to 8 groups of 62-digit calling card numbers. Compatible: Both prepaid calling card and postpaid call service are available. Easy Programming: Dialers can be programmed manually using the keypad of telephone set. Auto Reroute: Local/long distance/IDD calls with certain prefix numbers can be rerouted to corresponding calling cards automatically.