4" tall. Takes1 9V battery, not included. Motion activated, shake it and it makes one of 6 different battle sounds . Tested and works. Does NOT include the wristband for attaching it, just the unit. Smoke-free home. 100% satisfaction guarantee on every item we sell, love it or we'll send you a prepaid return label and a full refund, we're always here to help if you have a question or concern, feel free to reach out.