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VD40/VD40S/VD40E
模型: VD40是一款4G有线定位终端，VD40S是一款2G+4G有线定位终端，VD40E是一款2G+4G有线定位终端，提供两线、四线和八线三种型号。
产品介绍
The VD40 is a 4G wired positioning terminal, the VD40S is a 2G+4G version, and the VD40E is a 2G+4G version, all offering three models: two-wire, four-wire, and eight-wire.