Convenient on/off switch. Pet Blinker is a compact accessory that easily attaches to collars, leashes and harnesses to give you added security and peace of mind knowing you and your pet are visible at night. Lightweight Pet Blinker is only 1/2" long. Clasp is 1 1/2"long. Visible from over a half mile away! Small Pet Blinkers are for small and medium breed dogs. Operates on 3 AG3 batteries included with purchase.  Jade/Yellow.