Vamo instructions:
1: Output Voltage from 3.0V to 6.0V, adjusting the working volt +- 0.1V by pressing + and - buttons.
2: Keep pressing the + button more than 3 sec, OLED screen displays the present working resistance.
3: Keep pressing the - button more than 3 sec, the OLED screen showing the battery volt.
4: 5X click, OLED screen displays " on " or " off ".
5: Output power 3W~15W.
6: Max Armature Current 5A.
7: on/off Mode allows you to shut the unit off completely.
8: Reverse battery protection keeps circuit safe if the battery is installed backward.
9: Battery Monitoring shuts the unit off once battery has reached end of charge.
10: Amperage limiting system protects against over current situations.
11: Thermal Monitoring shuts the device off if it detects a high temperature condition.
12: Fit atomizers with resistance 1.5~5.0ohm.
13: Time limit protection function, it will shut down with more than 10s each puff.
14: OLED screen displays " LO-Ω" if resistance lower than 1.2ohm, "LO-V" if short circuit.
Specification:
Packing 1
 
Full set Vamo v2/v3 contains:   
Gift box 1pcs 18350 /18650battery 2pcs   
Variable voltage handle 1pcs Charger 1pcs   
Short battery tube 1pcs EN manual 1pcs   
CE four atomizer or  other 1pcs  
Packing 2
 
Full set Vamo v2 contains:   
Gift box 1pcs 18650battery 1pcs   
Ego case 1pcs Charger 1pcs   
battery tube 1pcs EN manual 1pcs