Operating conditions: The product uses solar power technology、 not batteries、 in the sunlight、 the light energy is converted to kinetic energy straight Then driving a low-power micro-vibration motor、 achieve product-specific vibration effects (which can shake the body、 like feed Like back、 left and right rotation like food in general)、 the product that is novel and unique、 environmentally friendly energy saving、 stylish、 compact styling Delicate、 easy to carry、 but also the Enlightenment school students the concept of good teaching supplies solar energy. Uses: Fine workmanship as spoof toys、 can frighten your friends and colleagues. Dimensions: 2.17 in x 0.79 in x 0.59 in (5.5 cm x 2.0 cm x 1.5 cm) Weight: 0.71 oz (20 g)