Frequency agility enables you to operate the PRO850 within the 470-740 MHz UHF band. These synthesized frequencies can be selected in 25 kHz increments over each 18 MHz operational band so you can easily choose from 720 different transmit and 720 receiveUser-friendly graphical interface on the base makes it easy to set up the system and obtain status information using the LCD display and menu keys. Pull-down menus on the LCD provide fast, easy access to all system features. Menus are organized by status, audio-level monitoring, system configuration, and system information. Simple navigation buttons and multi-function rotary knob facilitate the setup and access of desired features.Expandable system allows you to configure the PRO850 to meet your communication needs. A standard PRO850 System comes with four belt packs and a base station. By linking several base stations to provide additional receivers, up to 16 users can communicate w Automated belt pack output power control helps optimize the system operating power.The base station automatically configures belt pack settings and calibrates the power level for each belt pack, depending on its distance from the base. This eliminates base rec PC interface using HME's PC850 Software lets you configure the entire PRO850 System and manage configuration files from the convenience of your PC via the RS-232 serial or USB port. Intermodulation-free frequency groups have been pre-configured to help you easily scan and select the best, interference-free frequency groups when you set up the PRO850. The savvy user can also configure additional frequency groups for a quick recall.