Photoelectric target structure
The photoelectric target is very thin. In the vacuum glass tube, the side of the photoelectric target facing the scene is a signal board. It is a layer of transparent metal conductive layer sprayed on the glass board. It has the characteristics of uniform thickness, high transparency and good conductivity. The other side of the photoelectric target is the photoconductive layer (photocathode), which is composed of a layer of photosensitive semiconductor material evaporated on the signal board. 
Tws Bluetooth Earphone is amazing, true wireless design but give you 360° double surround stereo sound. One for two with smart function, two phones or computers can be connected/used simultaneously. And also smart safe charging, give you a greater choice.
Compared with traditional wired earphones, true Wireless Bluetooth Earphones bring you new experience that are more portable and easy to use. It can work within the range of 10-15 meters from your mobile phone, not only to avoid the entanglement of cable, but also to prevent the loss of mobile phones in a certain range. TWS Bluetooth Earphone has more convenient multiple functions that can not be replaced by the cable headphones.
As the stereo Bluetooth Headset of XT series, our company USES the chip above CSR4.2 and the real copper ring and graphene speaker to realize the sound quality similar to high resolution audio. Our company has applied for patents from China, Japan and the EU, as well as various certificates such as CE, ROHS, FCC, SGS, etc., contributing a lot to the worldwide music fans to enjoy high-quality music everywhere.
Tws Bluetooth Earphone,Bluetooth Earpiece,Wireless Bluetooth Headset,Wireless Bluetooth Earphones
ShenDaDian(China) Digital Electronics Co.,Ltd , http://www.btearbuds.com