Compatible with Mitel/Shoretel IP485G*Up to four BB424 devices can be connected to an IP485G phone*If two or more BB424 are connected to one IP485G, an external power supply is required (not included)*272 x 480 pixeled, 24 tricolor, backlit LED screen and
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Item# : SPM14744818532
Model # : PRa-2200-66070-001