Description 1. Working Voltage: 3.2V~9V. One piece LED driver of high efficiency and constant current inside the bulb which enable to use in wide voltage and keeping brightness constant. 2. LED power: 3W 3. Long Life time: More than 50000 hours 4. High intensity: >150LM. LED brightness is higher than incandescence bulbs in the same power flashlight. 5. Lamp holder: Standard P13.5 or E10. 6. Environment, energy saving friendly and shock-resistant Special Feature 1. The bulb has function of “TACP” (Temperature Auto Control Power). That means the output power of bulb’s driver will be controlled automatically according to different temperature, it will be enable bulb to fall temperature and working in the best. 2. The bulb has function of reverse polarity protection. That means when connect anode and cathode of power supply reversely, although the bulbs are not working, LED driver will not be damaged. sue at dosoe dot net