In case the main light won’t turn on, please charge the device: -> check that the USB cable is powered, with a green LED on near the magnetic plug, -> that it is firmly attached to the lamp, and -> that the battery switch is ON.With the main light off, the smart cap light will be pulsing to indicate that the device is charging: if not, please check the connections once more, or contact TEXLUM for support. DO NOT TRY TO CHARGE IN EXTREME TEMPERATURE OR CLIMATE CONDITIONS. In case of very low battery, let it charge for at least 15’ before turning the main light on. Please refer to the OPERATING INSTRUCTIONS chapter od the User's Manual to turn the light on, following all instructions meticulously. An improper use may cause damage to the device and/or its battery, potentially leading to dangerous overheating, fires, explosions, and/or battery leakage.