There are 4 gears: quick flashing,slow flashing, Lighting for a long time and turn off. The battery can replace and it can work for about 60 hours. You can removable battery when clean it and put the battery back when it dry. Aslo the LED band is waterproof, and it still brighten when you put the LED band in water. Different from all the Slap Bands in the market, the heat sealed technology requires the top and bottom fabrics to have a TPU coating while they were sonic pressed to join together. This make the product not only water resistant, but also sweat resistant (sweat is one of the major problems in the existing ones in the market that is cause corrosion to the batteries). Small Lithium Battery powered LED lights provides 360 degree ultra-high visibility in dusk and night time activities. The brightness is much higher than the glow in the dark glow sticks. Reflective printing on the top provides extra security for runners, joggers, cyclists, those walking their dogs, kids. You can accessorize for every event, party or special occasion with this LED bracelet.