The Lookah FIREBEE 510 threaded pen battery vape has 3 temperature controls and 650mAh of power for your 510 vape cartridges. This slimline vape battery is 98mm long and 14mm in diameter so it slides easily into any pocket or purse. The large-capacity battery has a digital display has a segmented battery readout. Together those show the voltage setting and the remaining battery life. The battery is available in one of 5 colors. Black, grey, red, blue, or orange. How to Use the FIREBEE 510 thread battery. Turn on/off - 5 clicks of the power button within 2 seconds. Change voltage mode - double-click the power button. Three voltages Mode 1, 3.2V Mode 2, 3.6V Mode 3, 4.0V. The voltage is indicated by a number (1, 2, or 3) shown on the display screen.