Medium-sized dog collar M code width 2.5 cm the shortest 40 cm the longest 48 cm scale range 8 cm. material qualitative : high-density printing ribbon + LED super bright light flat fiber (new material) + light soft plastic box (high quality soft glue) affixed cloth + high quality Japanese plastic buckle+button batteries. battery: button batteries (long light time enhanced version 2032) battery available for 70 hours normal in 2-3 months; Convenient and quick shockproofwaterproof replaceable supermarkets and convenience stores are available light-emitting way : internal contact switch you can set the flash quickflashingslowflashingkeep lightingclose four light way packing : single OPP pack