The Nitecore NWE30 is an ultra compact emergency whistle designed for outdoor emergenices, with a 120dB buzzing output. The device is operated by 1 x CR123 single use battery (included) or 1 x RCR123 16340 li-ion cell. The whistle has an easy to operate twist-and-buzz interface. Instead of the conventional method of blowing, the NWE30 aims to save energy and time especially if the user is suffering with a severe injury and requires urgent assistance. To activate simply loosen the tail cap and to turn off, tighten the tail cap. Once on, the whistle will buzz every 10 seconds. In addition to the whistle, the NWE30 features a 2000 lumen smart sensor flashing beacon light. Utilising the 4 x Luminus SST-20-W LEDs and a cylindrical PC diffuser, the unit emits a 360º flash at night or in the dark and will turn off automatically to save power and ensure a sufficient runtime. Compact and lightweight, the Nitecore NWE30 weighs just 35g (excluding battery) and can easily be attached to your gear using the included key clasp.