Most-complete Losei BT-K2 truly wireless earbuds pair Specs

talk time
of weight
Bluetooth Version
The BT-K2 is the only Losei bluetooth headset we have on file.
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General Specifications
Weight (ounces)0.2 oz.
Weight (grams)5.7
Dimensions1.1 x 1.1 x 0.8
Dimensions mm27.9 x 27.9 x 20.3
Wearing stylesIn-ear
Main categoryTruly wireless earbuds pair
Release year2017
Release month06

Under The Hood
Stand-by Time1.4 weeks (Equivalent to 10.0 days or 120 (one earbud stands by for 120, and a set for 60) hours)
Talk time4.0 hours (240 (one earbud works for 180-240, 120-180 when used as a pair) minutes)
Music Playback Time4.0 hours (240 (one earbud works for 180-240, 120-180 when used as a pair) minutes)
Battery Power40mAh (earbuds), 450mAh (charging box)
Battery charging time120 minutes
Wireless charging
Physical Specs
Width (inches)1.1
Height (inches)1.1
Depth (inches)0.8
Width (mm)27.9
Height (mm)27.9
Depth (mm)20.3
Bluetooth Technology4.1 + EDR
Bluetooth Profiles SupportedAVRCP, HFP, HSP
Other Specs & Features
Warranty1.5 years
Available colorsBlack, Red, Silver
Special Included AccessoriesSpare ear caps, Ear hooks
Control buttonsMultifunction button
Indicator lights (pairing and battery status indicator)


The Losei BT-K2 has pretty respectable battery specs for a cord-free Bluetooth headset, as evidenced by its 2-to-4-hour talk time and 120-hour stand-by (both on a single charge) -- having the capacity to extend further by using the 450mAh charging box.

Also called Losei True Mini K2.

Useful Losei BT-K2 Stuff:

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