Retractable cable is usually double-pull-style.
The retractable cable is very easy to carry. Generally, 1 to 2 meters of net wire is made flat and soft wire, which is made into a coil with spring zhuan and other things. It can be stretched as long as you need, and retract back when not used, like a tape measure.
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The AC power supply directly supplied by Shaanxi Xidian Keda Huacheng Electronics Co., Ltd. is based on the innovation of solving the above problems. The product adopts the method of serial LED segmentation control, which enables the power factor, electromagnetic compatibility and other technologies to reach the international LED standard, which well solves the bottleneck of the driving power supply of the semiconductor lighting fixture to the efficiency, life, cost and large-scale promotion of the lamp.
After the national light industrial electric light source product quality supervision and inspection Baoji station and Shaanxi Province electronic industry product quality supervision and inspection station test: the product's drive power life is matched with the LED light source life, synchronously reached more than 50,000 hours; at the same time, the drive circuit conversion efficiency reached 95%, which is higher than the conversion efficiency of about 85% of the existing LED driver; and the cost is low. Since the driving power supply does not need transformers, inductors, electrolytic capacitors, etc., the driving power supply cost is 20% of the cost of the same power switching power supply. .
Experts pointed out in the appraisal opinion that the project solved the control problem of LED lamps at home and abroad, which is the first in China, with international leading level and large-scale promotion conditions. 
Usage: double pull retractable cable, take the two ends of the retractable cable with two hands.Pull in the opposite direction and there will be a click in the middle. Repeat several times and choose your own length.When not in use, pull out a little bit when you hear the voice, let go of the telescopic cable will automatically retract.
Xidian Keda Huacheng Electronics develops AC power supply direct power LED lighting
It is understood that the traditional LED lighting has the advantages of high luminous efficiency, obvious power saving effect, long life, no pollution, anti-vibration, etc., but usually it is powered by DC drive power supply, that is, it must be installed in the luminaire to convert the alternating current into direct current. The constant current drive power source has the shortcomings of short life, low efficiency and high cost in actual use.