Please allow me to run a question and recall some used earphones.
I remember spending a great deal of money (320 blocks) into a Sennheiser px 100 headset ten years ago
The first ear was shook (jian) to (si), and there was such a nice earphone in the world. It was really a penny. Px100 accompany me for seven years, seven years of itch I always want to find a reason to change headphones, but how it is not bad, has not been bad, always not bad, can not find any reason, and finally my pro son Helped me out of my life and put the two ears of px100 to abortion. Finally, I waited until this day. I used the LD to install a poorly-replaced earphone and later changed the Sennheiser IE80.
It impressed me most is that the bass and sound field is very good, a little to hear the sound. Since I entered the IE80, I have been out of control, and I have bought ONKYO DAC-HA200 amps (my private money) over and over again.
The sound of the second room did not increase much, the volume was not small, and it took a lot of work and commuting. It took less than a month to go out.
One year later I bought Dafa 1ADAC
Black technology that has heard of Dafa has its own DAC. The bigger the hope is, the greater the disappointment is, the quieter the sound is, and the place where there is no color, the louder the sound field is. Gradually began to doubt that he doubted life. Am I a fungus? Later, it was discovered that this was a pit, and he vowed to climb out of the pit. He did not pay attention to the headset for a long period of time. He did not listen to the song for a long time, and slowly detoxified.
The spring flowers blossomed. Recently, the air is not bad. Walking or riding to and from work, of course, is accompanied by music. The headphone cable on the road is really annoying, and I got the idea of ​​buying a Bluetooth headset. I have a long heart and I have to find a reason. Oh, yes. At night, I can listen to the video with a Bluetooth headset. It does not affect my family. This is a good reason.
Start looking for Bluetooth headsets, as the saying goes from simple to extravagant and easy, from the luxury into the simple, found cheap headphones can not enter the law, but do not want to burn headphones, had to pull this grass, contradictory psychological. Suddenly an idea flashes through the head. Is there any device that can turn a wired headset into a Bluetooth headset?
Almighty mother gave me the answer, a treasure of a panacea to find what I want, only you can not think of, not a treasure can not buy. Found a few paragraphs, the size is quite appropriate, that is, those original physical keys is too low, until you see today's pig's foot hammer key A1 (finally back to the topic)
A1 is inexpensive, but tens of dollars can satisfy my needs. I was very excited at the time. Isn't this the best of both worlds? After the horses got on and off the order, the arrival of logistics took place on the second day of delivery. I was really disappointed when I saw the packaging. The packaging was too shabby. We opened the box roughly, pulled out the A1, plugged in headphones, and turned on the power. Connected to Bluetooth, the entire process goes all-in-one and everything looks natural. The whole process has always been a voice prompt in the ear.
The following briefly describes the appearance
Accessories from left to right are lanyards, cords, clips, caps with holes, cable managers.
A1's design is very simple, a round physical buttons, around the round button red LED breathing light a week, I feel the white light should be more advanced.
There was a microphone next to it. It wasn't photographed, and it was possible to make a headset without a remote control answer the call. Below is a charging port. 
There is no short headphone cord, only the cord is wrapped around, but it feels bad. 
Talking about the sound quality, using it to push IE 80 is still good, and plug wire to listen to not much difference, but pushing the Dafa 1ADAC is a bit difficult, the sound is completely incompressible, to push large headphones, children's shoes can be given up, and the active speakers did not Try to launch sound should be no problem.
advantage
Simple design.
Good portability.
4.1 Bluetooth, to ensure a good sound quality.
Voice prompts, real voice (device connection is a happy tone, connection failure is a frustrating tone), and creative.
Shortcomings
Rough workmanship.
Only about 4 hours of battery life.
The above comments are only personal opinions. It really feels that it takes a few tens of dollars to turn a favorite headset into a Bluetooth headset. It feels quite unexpected and worthwhile. The first time you write a review, please also ask the gentlemen to give it light.
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