1-year battery life - no recharging needed!</br>24/7 wearability - swim-friendly with 5 ATM water resistance.</br>Kid tough - easy to put on?? the 1-size-fits-most?? nonstaining?? 1-piece band stretches over your child's hand and fits comfortably.</br>Ages 4-9 - stretchy band is designed for wrists up to 150 millimeters. V?vofit jr. XL accessory band or v?vofit 3 bands may be used for larger wrists or older kid