Connect a standard adaptor to the charger input port, plug it to the power source, then ZK1 begins to self-detect. After the self-detection is completed,
push the current switching button to select charging current 0.25A/0.5A/1.0A. It stops when battery is fully charged(4.20V). 
ZK1 can charge different types of 3.7V lithium batteries.
① [0.25A] can charge a battery at a time: 10440/14500/14650/16340/16650/17650/17670/18350/18490/18500/18650   AA  AAA   
② [0.5A] can charge a battery at a time: 16340/16650/17650/17670/18350/18490/18500/18650   AA  AAA 
③ [1.0A] can charge a battery at a time: 18500/18650    AA  AAA 

Features:
1. Over-charging protection & Auto-detect charging function
2. Activation function (for low voltage battery which is not able to be charged)
3. Reverse polarity prevention
4. Short circuit prevention
5. Low power indicator
6. Surge protection
7. Reverse polarity protection

Specifications:

1. Adapter power: Input AC 100-240V 50/60Hz;
2. Output:DC 5V/1A
3. Input voltage for charging: 5V
4. Input Current for charging: 1000mA
5. Battery slot Output Current: 1000mA±10%
6. Auto cut-off Voltage: 4.2V±0.05
7. Battery outpout cut-off voltage: 3.0V±0.05
8. Operation Temperature: -40℃~+70℃
9. Storage Temperature: 0℃~40℃

Package Content:

1 X ZK1 Battery Charger；
1 X USB cable；
1 X User Manual;

1 X Warranty Card