Support one-touch trigger alarm, which may send help messages through high decibel beeps, flash lights or networking notifications (such as Bluetooth/Wi-Fi linkage mobile phone APP). No redundant decoration, only keep key information (such as "SOS" and placeholder text "LOREM IPSUM"), to ensure that in the panic can also be quickly recognized and operated. Small size, can be hung on the key chain, backpack or wrist, suitable for outdoor adventure, night running, the elderly living alone, children and other user groups. With waterproof, anti-drop design, adapt to harsh environment.