To provide a rescue system that allows users to confirm the safety and positions of each other and utilizes a portable energy storage system and radio communication.SOLUTION: A portable energy storage system (P-ESS) includes a wireless communication module that forms a local wireless network, and the portable energy storage system provides wireless communication between terminal devices in a local wireless network formed by the wireless communication module. In an area or a situation in which communication is not available, communication between terminal devices is enabled in the local wireless network, and users can confirm the safety and positions of each other.SELECTED DRAWING: Figure 1
展开▼