This is the XS Scuba Rattle Pointer with Attached Clip Noisemaker Features: Give it a shake to get your buddies attention Nice and loud underwater sound Use opposite end to point out small critters Built-in attachment clip Dimensions: 13.5 x 1" (34.3 c 2.5 cm) XS SCUBA Underwater Sound Rattle Pointer With Built In Attachment Clip will get your diving partner&';s attention. Simply shake it and a loud noise can be heard underwater. Great for group diving or anytime you need to identify your location underwater."