Illuminated Apparels light up pet collar is the perfect accessory for keeping your pet safe and visible at night SM - 31-41 CM ML - 41-51 CM ✮ Stay Safe & Visible at Night ✮ Fully Adjustable ✮ Rechargeable Battery (USB Lead included) ✮ Reflective Stitching for extra visibility ✮ 12-14 Hours Battery Life