onegood LED Blue Magnetic Light Lamp Charm Pendant Necklace Party Disco Kid Children Xmas Birthday Gift (Heart-Shaped) Luminous color: Blue Battery: AG10(Necklace battery can be replaced after Run out) Pendant size: about 4CM Fit for Camping, parties, banquets, birthday parties, concerts, bars and other night-place practical A perfect presents to you lover,friends and family Package Included: 1 x Blue LED Light Lamp Necklace