The VX-P820 Series are the smallest P25 portables (4 inches tall and 2 inches wide). The VX-P820 portables offer a wide range of features in three different versions.  The VX-P821 has 16 channels with 1 group, VX-P824 has 512 channels with 32 groups and 4 function keys and VX-829 has 512 channels with 32 groups, a full 16 button keyboard and field programmable.  The frequency ranges are 134 – 174 MHz or 450 – 512 MHz (in one radio, no sub-bands) and 700 mW audio output power and intrinsically safe.