ClearComm is Concise Mobile's Web-based communication engine that allows connection and data transmission from the handheld device to server resources. Several connection methods are supported, including VPN, CDMA, GPRS, Ethernet, or dial-up modem. Users connect from the road, at the warehouse, from cable or DSL connections at home, or via cellular connection. There are no inherent limitations to the number of simultaneous devices that can be connected. Once connected, daily invoices, inventory, and other transaction data is transmitted (uploaded), followed by reception (download) of customers, prices, promotions, etc. With ClearComm software, upgrades are fast and easy: only updated modules are transmitted and installed.