Note: K3 is the Upgrade version of K2.The signal is better than K2. 
K3 Twins Wireless Bluetooth V 4.1 Stereo Headset Dual Mini Bluetooth Earpiece True Bluetooth Earbuds with 500Amh Power Bank.

Notice ：K3 Upgrade version of K2. The signal is better than K2. K3 Twins Wireless Bluetooth V 4.1 Stereo Headset Dual Mini Bluetooth Earpiece True bluetooth Earbuds with 500Amh Power Bank .

*Independent   "double"   headset design, completely out of line of bondage.
*Super mimi long standby time stereo bluetooth headset imported British high-tech CSR chip.
*Super compatibility, it compatible with 99% of the bluetooth smart device in the market.
*2 in 1 bluetooth charge, long lifetime, necessary for driving/work/puts ide/sport
*Super portable bluetooth headset, intelligent answer of reject calling, super long standby time.
*Safety power bank for emergency charge.
*Multi-point function operating, the headset support connecting A and B phone at the same time (The phone should have reconnect function).
*Stereo, excellent sound quality CVC6.0 noise canceling, free smoothly communicate Auto back pairing connection future last number re-dial function
*Headset can up to 30-40 hours total talking time and 1000hours standby time when the power bank full battery state .(While, the real talk time and standby time may be different because of different mobile phones , difference use methods and different environment.)

Specification:
Bluetooth: 4.1
Transmission distance: 10 meters
Battery capacity: 500MA
Standby time: 30 days
Charge input: 5V / 1MAh
Weight: 4.7g
Size: 20 * 20 * 100MM
Frequency: 3.4 - 4.2V
Output: 5V


Note:
1. Power bank input voltage: 5V
2. On power bank charging state, the ear-buds can't be charging at the same time. 
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K2 Version