Express your support for Extract Labs by using our branded 510-thread battery. This rechargeable kit includes a USB cord for versatile usage. The draw-activated battery is user-friendly and portable. Simply connect the USB cord to the battery and plug it into a suitable port. The light tip will remain illuminated during the charging process. Once fully charged, the tip will flash 20 times and then turn off. If a connected device is not lit up, it indicates that the battery is fully charged. Disconnect the USB adapter and attach an Extract Tank. The buttonless pen will activate when you inhale.