bluetooth Version V5.0, 3.7V, Standby Time 25h, Impedance 32Ω, Receive Sensitivity 110dB, Earphone: 43mAh*2, bluetooth Chip Realtek8763BRC, Working Time (h) 3-4h, Frequency Response 20-20kHz, Transmission Distance 10m, Microphone Yes, Charging Time (h) 1.5h, 3.7V, Battery Capacity Charging box: 380mAh.
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Updated:
Banggood
Warehouse in Europe 
.
Link: Haylou GT2 TWS Earphones [EU]
$25.51 with coupon: BGAFF10OFF
$25.51 with coupon: BGTT10
$25.51 with coupon: bGhOnEy10
Additional Banggood coupons:
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Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Haylou GT2 TWS Earphones ($-3)
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