DubCharge Nano - Palm-Sized Battery

Features: 

• 15 Minute Auto Shut Off
• Over Charging & Shortage Protection 
• USB-C Charging 
• Adjustable Voltage (2.8V, 3.2V, 3.6V, 4.0V)
• 12 Second Preheat Mode 
• 12 Second Pulls 
• 500 Mah Battery