Vision II 2 Spinner Buy 2 Get a Free USB Charger For every 2 you buy, we'll automatically add a USB charger. No need to email us - it ships automatically. Package Includes: 1x Vision 2 Spinner 1650mah battery with box. (USB charger optional) Compatibile With All 510 threaded accessories 1. Brand new and upgraded battery cell of 1650mAh, which makes the Spinner II even more powerful. 2. Longer life span for the new upgraded PCB and battery cell. 3. Adjustable Voltage from 3.3V to 4.8V. 4. Charging cycles more than 750 times. 5. Spin Dial for adjustage output voltage. 6. Metal button with more than 20,000 pressing durability. 7. Power indication. How to adjust output voltage · Vision Spinner II is capable of outputting voltage from 3.3v to 4.8v. · The bottom scale indicates the position of voltage output level. · Rotate the bottom spin to align the red line with the bottom scale to arrive the voltage output level as marked in number. · The red line on bottom spin can stay at any position along the scale between 3.3v and 4.8v to fine-tune your voltage output, despite the four locking position at 3.3v, 3.8v, 4.3v and 4.8v. Sold in Stores For $34.99 Yours for only $9.99 USA Seller - Shipping is FREE NEW!! Just Arrived Vision 3 III Fully Upgraded Only $14.99