Feature: *Does the LED flexible filament need a heat sink? Answer: The LED filament does not need a radiator, and the LED uses current ≤10mA, and does not require heat dissipation. *Can the LED flexible filament be lighted up with battery DC3.7V? Answer: No, our LED filament voltage is standard DC3V. *If you use DC3.7V, the voltage is too high and the filament temperature is very high, which will burn out the lamp beads. *Where is the LED flexible filament used? Answer: Generally used in light bulbs, DIY hand-made toys, DIY decoration design. *Can the flexible LED filament be 90 degrees vertical? Answer: No. Maximum bending angle of LED filament≥30° *Can the flexible LED filament be freely cut to length? Answer: No. If it is cut, it will not light up. *Can the length of the LED flexible filament be customized according to customer requirements? Answer: No. All are fixed length, unless customized in large quantities (≥10,000 pieces) *Can LED flexible filament work in water? Answer: No. But you can DIY by yourself and put a transparent plastic tube on the outside of the LED filament, and it can work in water. *What is the CRI of the LED flexible filament? Answer: CRI≥80 *What is the maximum current of the 130mm and 300mm LED flexible filaments? 130mm and 300mm maximum current must be ≤100mA *How to light up the LED flexible filament? Answer: Two AA batteries connected in series = 3V can light up the filament, or use 3V button battery CR2032. Details: *Material: FPC *Size:130mm，300mm *Voltage: DC3V *Color : warm white(light) *Color temperature: 2200K *Quantity: 10pcs Package content: 10Pcs bulb filament Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. *Material: FPC *Size:130mm，300mm *Voltage: DC3V *Color : warm white(light) *Color temperature: 2200K