  This paper deals with $(K_1, K_2)$-quasiregular mappings. It is shown, by
Morrey's Lemma and isoperimetric inequality, that every $(K_1,
K_2)$-quasiregular mapping satisfies a H\"older condition with exponent
$\alpha$ on compact subsets of its domain, where \begin{align}
\alpha=\begin{cases} 1/K_1, & \text{for } K_1>1, \\ \text{any positive number
less than } 1, & \text{for } K_1=1 \text{ and } K_2>0, \\ 1, & \text{for }
K_1=1 \text{ and } K_2=0, \\ 1, & \text{for } K_1<1,\\ \end{cases} \end{align}
Differentiability almost everywhere of $(K_1, K_2)$-quasiregular mappings is
also derived.
