This is a used AT&T Model 1750 digital answering machine in excellent condition. It's been tested, and is working. Comes with power cord and quick reference "wallet card". Sorry, no original detailed documentation, but it's not a difficult machine to figure out. This unit supports digital recording of out-going and incoming messages, remote playback, and up to three separate voice mailboxes. Time and day of receipt information is announced when messages are played back. The cover above the message LED opens, controls for various settings are underneath. Under the lid are more instructions for basic use. You can use a built in generic or personally recorded greeting. AA batteries can be installed to provide backup power to retain messages in a black-out, or if the machine becomes unplugged.

This is a terrific answering machine, but I don't need it anymore so am offering it in the hopes someone else can get some use out of it. AT&T has manuals for many of their products here:

http://telephones.att.com/telephones_ui/support/dsp_manuals_list.cfm#257

I couldn't find the manual for this exact model, but a few of the models listed are similar.

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Payment must be made within 7 business days by Paypal . Shipping within the United States is via US Mail Parcel Post. This item will be shipped carefully, with plenty of padding, in a box suitable for its safe delivery. International bidders are welcome, but please check the cost of shipping and duty to your country before bidding. International shipping via US Postal Service will be strictly at the buyer's risk, since I can not insure such shipments or reliably track delivery.