High-capacity, rechargeable,lithium-ion battery. Ergonomically designed to fit comfortably in the user?s hand, Three working modes: full power mode, crescendo mode, and flash mode, Constant light intensity-The solidification effect is not affected by the consumption of remaining power, Light probe is made of high quality glass fibre, Time setting:  3s, 5s, 10s, 15s, 20s, 25s, 30s, 35s, 40s. 60s, 99s