Blink Petz Flashing Dog Tag This Blink Petz Flashing Dog Tag is motion activated! Simply attach it to your dog's collar and the 2 bright LED's will flash when your dog starts moving Suitable for medium to large dogs, it measures around 7 cm x 8.5 cm x 2 cm The fob contains demo batteries and comes with spare ones that should last around 150 000 flashes! This makes a great dog gift and stocking filler!