The harness is made of nylon mesh and powered by 250 mAh rechargeable battery which has estimated life of 6-8 hours just one simple charge. Mesh dog harness has three kinds of lightning mode which is continuous on, slow flashing and fast flashing. People can select lightning mode by pressing the switch located in the battery compartment. LED dog harness large, led dog harness middle, led dog harness small, different size match for all kinds of lovely dog.