XS size: suitable for neck of 28-38cm, width of 2.0cm, total length of 41cm, weight of 37G, using 2 CR2032 batteries


S size: suitable for neck of 34-41cm, width of 2.5cm, total length of 44cm, weight of 50g, using 2 CR2032 batteries


M size: suitable for neck of 37-46cm, width of 2.5cm, total length of 50cm, weight of 56g, using 2 CR2032 batteries


L size: suitable for neck of 41-52cm, width of 2.5cm, total length of 56cm, weight of 58G, using 2 CR2032 batteries


XL SIZE: suitable for neck of 42-56cm, width of 2.5cm, total length of 60cm, weight of 60g, using 2 CR2032 batteries