1.Material: TPE Or TPU. 2.Powered by 2pcs CR2032 battery, which could be changed easily. 3.Body color: white or OEM color. 4.LED color: Red, blue, green, white. 5.Press the on/off button then led will flash. 6.Two flashing ways: fast flashing and steadily light. 7.Makes the dark night more safety,and helps improve visibility. 8.Be good for Sport, Cycling, walking, Jogging, running and cycling in low-light environments, 9.Ideal partner for early morning and late evening walks. 10.With additional reflective part on band 11.Be water resistant, no worry about the rainny day. 12.adjustable to fit both arms and legs.