大家来看看 老外要求的这种灯 到底是什么灯啊

做一个国外的项目时候
老外的合同中对照明系统中有个这样的要求
Emergency Lighting - Portable
Emergency portable rechargeable h and lamps shall be of the wall mounting charger/lamp
type. The lamp battery shall have a 4 Ah capacity with a discharge period in excess of 3
hours. The lamp shall be provided with main and auxiliary bulbs which can be switched
by an ON/OFF switch. A charge function monitoring LED is to be included.
这种灯 是手提式的 但是又可以挂墙安装？ 应急灯 什么意思？ 求达人解决