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What are EM-815, EM-825, EM835, and EM-845, what hand readers will they work on, and are these products field upgrade-able?

These are memory expansion products (expanding memory to 12K+ users, 25K+ users, 38K+ users, and 51K+ users, respectively). These products supersede EM-60X, EM-120X, EM-180X, and EM-240X. They work with the HandPunch 3000 XL and the HandPunch 4000 readers but are not field-upgradeable.

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