Yosoo High Sensitive Volume Adjustable Fishing Rod LED Fish Bite Finder Alarm Bell Sound Buzzer Weight: 73g; Bell Size (Approx): 80 x 50 x 65mm/3" x 2" x 2.5"(L*W*T) This Alarm is powered by 2 Pieces AAA batteries(Not included) Installation to the seat: 1.Fix the installation seat on butt section of the rod with with PVC belt supplied. 2.Insert te Alarm into the installation seat. Installation for the fasten belt: Wrap the belt on the butt section or the bottom of the next section of the rod Sensitivity Adjustable; Sound and light Alarm when the line pulled or sent back; Volume adjustable; Power By: 2 x AAA Batteries(Here not Included) Package Content: 1 x Fishing Alarm; Color: Black