The Yocan UNI Pro is a universal 510-thread box mod battery with an adjustable cartridge slot that fits any diameter cart from 10mm-14mm. Features a precise OLED voltage display with 0.1V increments from 2.0V-4.2V. 650mAh battery with USB-C charging and 10-second preheat function. The adjustable width and height ensures a flush fit with any cart. Available in multiple colors.