Cheap bluetooth headphone v4.1

Specifications
	k1	s3	Zealot E6	bt03 / k2	k21 / ipd21	k8 / lc-b30	TRANSCTEGO bt-01	mega mtuo v16	fineblue hf66	joway h02	Zealot e2	Y97	ttlife bh693 3CEB162	AWEI A833BL	Cosline s18	hoco e5	zealot e5	Thinyou d8	M.BH71

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Price			10 USD							9 USD	11 USD	13 USD
Bluetooth version	4.1	4.1	4.1	4.1 (upgrade?)	4.1	4.1 (upgrade?)	4.1	4.1	4.1	4.1	4.1	4.1	4.1	4.1	4.1	4.1	4.1	4.1 ?	4.1
Bluetooth Profile		A2DP/HFP/HSP/AVRCP ?	HFP v1.6 AVRCP v1.4 A2DP v1.2 DI v1.3 HSP v1.2							HSP/HFP/A2DP/AVRCP	HFP, HSP, AVRCP, APT-X	HFP v1.6 AVRCP v1.4 A2DP v1.2 DI v1.3 HSP v1.2
Sync multiple devices	Yes	Yes	Yes		Yes	Yes		Yes	Yes		Yes				Yes	Yes
Remark
Audio features
apt-x		No	No								Yes
Active Noise Canceling	Yes	Yes cvc6.0		Yes ?	Yes cvc6.0	Yes dsp	Yes cvc6.0	Yes cvc		Yes cvc6.0	Yes cvc6.0	Yes cvc6.0				Yes cvc 6.0
stereo				Yes	Yes	Yes 3d				Yes	Yes
HD	Yes	Yes				Yes		Yes							Yes	Yes		Yes subwoofer, 360gr shock bass
Sensitivity	120 db	102 db		98 db	112 db	109 db		102 db	123 db	112 db	105 db	122 db	96 db		123 db	120 db	87 db	123 db
Resistance	16 Ω	32 Ω		16 Ω	16 Ω	32 Ω		32 Ω	16 Ω	32 Ω	16 Ω	32 Ω	32 Ω		9 Ω	16 Ω	16 Ω	96 Ω
Product details
Built-in microphone		Yes	Yes
Chip	CSR (8635 ?) / britain imported	csr8615	csr8615	csr	csr8	csr 4.1 of 4.0	iscc	CSR (8615?)	CSR8635 ?		csr	csr8635	csr8635	csr8610	csr britain imported	issc imported, 8 level, 80mhz cpu / csr		csr	csr8615
Extra earpiece		Yes ?		Yes	Yes		Yes	Yes		Yes								Yes
Brand	cosline
Model number								bt/20160608	rd-188						s18
Release date	2017 ?	2016 ?						2016 ?	2017 ?			2017	2016			2016 ?
Volume control	Yes	Yes		Yes	Yes	Yes		Yes			Yes				Yes	Yes	Yes
Voice control	Yes	Yes			Yes										Yes			Yes
Next music	Yes	Yes		Yes	Yes						Yes				Yes			Yes
English	- ?				Yes					Yes						Yes		Yes
Battery
Talk time	28 h	32 h		36 h	30 h	25 h		28 hd				6 h			28 h	3 h		28 h
Music time	24 h	30 h		32 h	24 h	24 h		24 h			5 h					4 h		24 h
Standby	35 d	55 d	60 d	70 d	45 d	1080 h		40 d	160 h		200 h	30 d			60 d	55 h		40 d
Charge time	3 h	2 h ?	2 h					2 h				2 h				2 h		2 h
Battery capacity	300 mah	230 mah	350 mah	300 mah	260 mah	230 mah polymer	150 mah	230 mah?		90 mah		110 mah	70 mah - 90 mah		260 mah	55 mah
Battery Information		- ios		Yes 4 leds	Yes 4 leds	- ios		- ios							- ios	- ios		- ios
Dimensions
Height
Width
Depth
Weight

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