Protect valuables or belongings against theft Prevent valuables or belongings being forgotten and left behind It is an automatic, active security system Patented auto on and auto sleep Slim and small sub unit Adjustable range setting from 1to 25 meters Offers safety, security and peace of mind Patented in the USA, Taiwan, Japan, mainland China and more Size: master unit (L x W x T): 128 x 29 x 14mm Size: sub unit (L x W x T): 73 x 24 x 6mm Weight: master unit: 45g (including battery) Weight: sub unit: 12g (including battery) Power: master unit: 3V DC (AAA/UM-4 battery x 2) Power: sub unit: CR2032 lithium battery VSPD: Loss warning alarm with range adjustment up to 25 meters