Bounded chain complex of groups

Definition
Consider a chain complex of groups $$(G_n,d_n)_{n \in \mathbb{Z}}$$. We say that this chain complex is bounded if there exist integers $$n_1,n_2 \in \mathbb{Z}$$ such that:


 * $$G_n$$ is the trivial group for all $$n \ge n_1$$.
 * $$G_n$$ is the trivial group for all $$n \le n_2$$.