The reason I wanted to buy this headset was to take the subway every day. The sound was very noisy. There was a Huawei am180 in my hand. The noise reduction effect was enough for me. I put on headphones everyday and I can read the book, but in the nearest There are some problems in use and no way to charge. So always want to change a new headset
Bought other noise canceling headphones before buying am180
Harman Kardon's noise reduction is too bad to wear uncomfortably
Harman/Kardon SOHOIINC Noise Cancelling In-Ear Headphone Silver 899 Yuan Jingdong Direct Link Jingdong own brand dostyle headphones, chuck, noise reduction, and finally retired
Am180 impression is pretty good, consider directly to buy Huawei am185
Huawei (HUAWEI) Huawei Active Noise Cancelling Headphones 2 (Champagne Gold) 499 yuan Jingdong direct link Good impression of the generation, but am185 this color does have a bright eye, start, found that the wear is not as comfortable as a generation, and it is easy to fall out, the sound quality has not improved over the generation, the price has increased a lot, the most important is the noise reduction is not Too satisfied, so the return.
Then consider changing to a slightly more expensive one. The feeling of head wear is a bit heavy and directly eliminates it.
Considered bose qc30, feel inconvenient to store, ruled out.
Bose QuietControl 30 Wireless Headset QC30 Earbud Bluetooth Noise Reduction Headset 2498 yuan Jingdong direct link Considered bose qc20, Jingdong engaged in activities in 314, there is no promotion for this, and that no black for a few days, are white, white too easy to dirty, and ruled out
Bose QC20 Active Noise Canceling Headphone Black - For Apple2098 Yuan Jingdong direct link Originally noise reduction headset is less, you can choose less and less
When Jingdong engaged in activities, some people broke the news and looked at the comments below. They felt that they did not meet my requirements and gave up.
Sony (SONY) MDREX750NA h.ear me series 1069 yuan Van Der An flagship store direct link Then 315 saw the news that day, after the ticket price is 1038, see the bottom of the value of friends commented that the Tmall flagship store was 998, there are 12 interest-free, cheaper than Jingdong 40, asked the Tmall's clerk, Can not be used on i6, they do not know, just around my colleagues have i7 original headphones, try it, no problem on the i6, but this can only be used on devices with Lightning interface, can not listen to music While charging, after measuring it was still a handful of people into this red i800, personally feel red is better than black
Pioneer i800 In-Ear Noise Cancelling Apple Headset Lightning Interface Red 1198 Yuan Jingdong Direct Link After receiving the package was found very refined
Can see suitable equipment, the newly released i7 began to cancel the 3.5mm headphone jack, but this production date and release date are earlier than the i7 release date
The first headset to support the Lighting interface is a Philips headset, and now more and more headphones that support Lighting
Direct Lighting equipment to the headset power supply, no battery box, the entire headset is relatively light, a total of 4 kinds of noise reduction mode, normal mode, open noise reduction, outdoor mode, monitor mode
After opening the plastic seal, opened to the protagonist
With 3 sets of earplugs, the one that comes with it generally works for me, so I didn't shoot the earbuds there, and I felt that the original earbuds were generally silicone
You can see the hymen
The addition and subtraction keys are all prominent. The song key and the noise reduction key are all recessed. After a few operations, they are remembered. 
Lighting interface
A family portrait, a headphone bag, but used to put the headset directly in his pocket
Just plug it in will remind the need to install the software, in the later use, found that the software is unloaded has no effect, but in the software interface can directly select the mode they need, if you want to press the button to select, respectively, is the normal mode, open Noise reduction, outdoor mode, monitor mode
The software's interface is very simple, the left point is to adjust the noise reduction, the right is the equalizer
You can set yourself what you want, but I didn't ask for it, so I use it directly.
Noise reduction interface, the top is the open button, and then according to their needs, select the mode is normal mode when inserting headphones
This is the state of noise reduction, you can feel less noise 
This mode reduces noise but still can hear the outside world
Turn on this mode, it will not filter people's voice
The software version has not changed for more than one month. It is estimated that the headset is still retired
The sound quality feels much better than Huawei's am180, and it still has a certain relationship with the price, I feel quite satisfied with the noise reduction effect.
advantage:
Lighter because there is no battery box, direct iphone power supply
Flat headphone cord, not easy to knot
Disadvantages:
1.Lighting interface, there are certain restrictions, after all, only Apple's equipment support
2. Each time you use it, you need to select it again to enter the noise reduction mode. It's better than the one-click convenience.
3 soft earplugs generally
Reverse Conducting Thyristor(RCT)
Reverse Conducting Thyristor(RCT) is also called Reverse- appreciation Thyristor.The characteristic is that a diode is connected in reverse parallel between the anode and cathode of thyristor, so that the transmitting junction of anode and cathode is short-circuited.As a result of this special circuit structure, it has high voltage resistance, high temperature resistance, short turn-off time, low switching voltage and other good performance.For example, the turn-off time of the reverse thyristor is only a few microseconds, and the working frequency is dozens of KHZ, which is better than the fast thyristor (FSCR).This device is suitable for switching power supply and UPS uninterrupted power supply. One RCT can replace one thyristor and one continuous current diode respectively.
Reverse Conducting Thyristor,Original Reverse Conducting Thyristor,New Reverse Conducting Thyristor,Reverse-Conducting Thyristor 2200V
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