Gvm video light has one year of free repair service, Please contact the manual or card for contact information.cri & TLCI 97+: with this Index you get plenty of brightness and excellent color, which is close to the true color of the sun (true solar index is CRI100 +) multi-function control: you can directly use a video light to control many video light's brightness and color temperature changes, and the control of the video light can be different color temperature and brightness (12 channels can control a large number of Lights, up to 10000) preset buttons: you can set the color temperature and brightness of each video light for each channel by your own photography lighting requirements. There are 4 buttons in each light, allowing you to freely set the brightness and color temperature combination. For example:1. Brightness 50%, Color temperature 3900k2.Brightness 100%, Color temperature 4400k3.Brightness 10%, Color temperature 5600k4.Brightness 77%, Color temperature 3200k 2 knobs: A knob to adjust the brightness of the video light from 10% -100%, a knob to adjust the color temperature of the video light that ranges 3200k-5600k lcd screen: The back of the LCD screen can display color temperature and brightness level two power supply modes: 1. Ac adapter (included) 2. Two battery (battery not included) thermal case: aluminum alloy thermal texture shell, The use of photographic lighting does not produce a little noise, The appearance of novel, the United States market Only GVM in the sale 8.Barndoors: included barn doors can gather light and better protect the light bead of the video light, prolong the service life of the video light bracket diffusers: equipped with a bracket diffuser in portrait photography by the soft and shiny skin color, no dazzling problems. u-shaped frame can rotate 355 degree