Unprofessional headphones QYC QY11 Bluetooth sports headphones

Remember the millet Bluetooth headset that I have reviewed before? I wrote that I bought the Bluetooth headset for use in running, and later found that it was not stable at all, so I got this QYC QY11 today, or used it during running. This time it perfectly satisfies my needs.
The black box is very simple, only one QYC logo on the front, the carton has a skin-like coating, feels good, and the weight is also increased.
Open the box is a carton, there are three small logos on it, it is also very simple, indicating that there are instructions, data lines, etc., the overall feeling on the packaging is good.
This is the manual, the warranty card, the machine instruction card, and the slogan "Let's in it" is also very simple, but I think that if it is all black, the effect should be better.
I took a close-up of the machine card. I don’t know what the tails have. I’m a person who never took the opportunity. Anyway, listening to it will not open.
There are a total of five pairs of earplugs, three pairs for listening to music, two pairs for talking, the big ones will not hear the outside sound, small can hear, but the music is basically no bass. Earplugs wear It's still quite comfortable, just pick the size.
I have to say that this data line is short, but the quality feels good.
Forgive me for taking the earphones when I just received it. Later, I can no longer put it as I just received it. It is pretty good to watch the headphones lying in the package!
This is the back, with some parameters and security code, but I guess there will be no cottage QYC, because the price is not expensive.
The overall black body, the cavity looks like a capsule, looks more textured, the hook feels good, hard but flexible.

Li-Ion Battery With Smbus refers to the battery datas can be collect through equipments based on SMBUS data communication, it usually applied to the military grade battery which need higher safety level protection .but as these battery have SMBUS inside ,it also should meet these requirements as :

1.The rated voltage is high (the operating voltage of the unit is 3.7v or 3.2v), which is about equal to the series voltage of three nickel-cadmium or nickel-hydrogen charging batteries, so as to form the battery power supply group

2.The self-discharge rate is very low, which is one of the most prominent advantages of the battery. At present, it can reach less than 1% per month, less than 1/20 of the nickel hydrogen battery.

14.8V Li-ion Battery With SMBUS

Items                                  specification

Charge voltage  :                   16.8V

Nominal voltage :                   14.8V  (4S4P)

Initial impedance :                   200mΩ

Nominal capacity:                    10.4Ah

Minimum capacity :                  10.0Ah

Communication methods :        SMBUS data communication

Charge current : Standard Charging::0.5C₅A (5.20A

                                Rapid charge 1.0C₅A C(10.4A) Max

Standard Charging method:  5.20A(0.5C₅A) CC(constant current)charge to 16.8V,then CV(constant voltage 16.8V)charge till charge current decline to ≤104mA(≈0.01C₅A)

Charging time: Standard Charging:4.5hours(Ref.)

             Rapid charge:   2.5 hours(Ref.)

Max.discharge current: 10.4A(1.0C₅A)

Discharge cut-off voltage: 11.0V

Shelf life:  2 years

Cycle life (0.2C₅A/0.2C₅A) : 500 times,≧80%DOD; 500 times,≧80%DOD

Li-ion Battery With SMBUS

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YFJ TECHNOLOGY (HK) CO.,LIMITED , http://www.yfjpower.com