Perfect Matching in Product Graphs and in their Random Subgraphs

For $t\in \mathbb{N}$ and ever $i\in [t]$, let $H_i$ be a $d_i$-regular connected graph with $1<|V(H_i)|\le M$ for some integer $M\ge 2$. Let $G=\square_{i=1}^tH_i$ be the $t$-dimensional Cartesian product of $H_1,\ldots, H_t$. We prove that if $t\ge 2\ln M$ then $G$ has a (nearly-)perfect matching.