SHENFAN Angel Wings Style Electronic Personal Protection Alarm for Anti-Theft ,Anti-Rape, Self-protection Security,Pink Personal Self Defense Alarm for People Who Love the Outdoors. Walk, Run, Jog, Hike Wherever You Want Light weight and sturdy, easy to use and carry This is the perfect gift for the safety of the women you love, and your peace of mind. Power supply are 2 LR44/1 AG10 batteries (included) and easily replaced when necessary to maintain full pow 100dB alarm is loud enough to create the wanted effect without damaging your own ears