XS Neck Circumference: 30cm - 37cm,Width Circumference;1.5cm
S Neck Circumference: 35cm-43cm, Width Circumference：2cm
M Neck Circumference:40cm-48cm,Width Circumference：2.5cm
L Neck Circumference:45cm-52cm,Width Circumference：2.5cm
XL Neck Circumference:52cm-60cm,Width Circumference：2.5cm

Package includes:
1xLED Dog Collar

• 00% Brand New And High quality,Fast Flash, Slow Flash or Constant Light setting,Weather resistant (but not for dogs who like to swim)!
• The New Design light up dog collar can be set to fast flash, slow flash or on constantly
• The included 2x CR2032 batteries will last approximately 90 hours before they need replacing
• The collar size can easily be adjusted and the quick release buckle allows you to put on and take off instantly.
• Ultra Bright Auraglow LED chip for high visibility at great distance (up to 1000ft),einforced quick release buckle with welded stainless steel D ring

00% Brand New And High quality,Fast Flash, Slow Flash or Constant Light setting,Weather resistant (but not for dogs who like to swim)!Aukmont