Quick and easy to attach to the housing with Velcro The lighting system can be attached to either side of the housing (right- or left-handed) The system has a battery life of 60 hours. It comes with 2 AAA batteries and a decorative cover (to protect the velcro when not in use) One size and one colour black universal for New Classic & New Comfort leashes Made in Germany Please follow the instructions for use and the safety instructions