Honey Stick VV Buttonless Vape Pen Battery Fetures: Auto-Draw / buttonless battery functionality. Variable Voltage Output: 3.5V (Blue), 3.7V (Green), 3.9V (Yellow) and 4.1V (Red). Preheat functionality. Stylus Touch Tip. 510 Thread Battery. Locking safety feature. 400mAh Battery Capacity. Screw-In USB Charger. Low power indication alert ( 10 Blinks).