650mAh Display Screen Battery with USB C Rechargeable and it comes with 5 sets 

Variable Voltages (2.1V ,2.5V , 2.9V , 3.3V , 3,7V) and 1.8V Preheating.

The Display Screen Shows Voltage and Battery Power. It works For all 510 Thread Vape Cartridges!

• 650mah Power Capacity 

• Standard 510 Thread

• 5 Clicks Turn on/off

• Kit including one 650mah Battery+ USB C Line

• White or Black Color

• L100mm* W14mm

• Works for all 510 Thread Carts

• AAA Grade Li-ion Battery Cell

• 3 Clicks For Variable Voltage

• 2 Clicks For starting Preheating

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