Sharp upper bound for the first eigenvalue

Let $M$ be a closed hypersurface in a noncompact rank-1 symmetric space $(\bar{\mathbb{M}},d{s}^2)$ with $-4\le K_{\bar{\mathbb{M}}}\le -1,$ or in a complete, simply connected Riemannian manifold $\mathbb{M}$ such that $0 \leq K_{$\mathbb{M}$} \leq \delta^2$or$K_{$\mathbb{M}$} \leq k$where$k = -\delta^2$ or 0. In this paper we give sharp upperbounds for the first eigenvalue of laplacian of $M$.