An excellent vape deserves an excellent battery. Optimized to make your vapes taste better and last longer, the STYLUS is the perfect companion for your Fernway cartridge – and now with upgraded features: USB-C: For faster, more reliable power Power Gauge: No more lower battery surprises Passthrough Charging: For an uninterrupted sesh. Use the included USB charger or any USB-C cord to recharge. Operation Guide Wake/sleep: 5 clicks Heat selection: 3 clicks Preheat: 2 clicks (for cold weather/clogs) Battery life check: 4 clicks Green = full, amber = medium, red = low), Temperature Spectrum Green (2.6V) – Max flavor, less vapor Blue (3.0V) – Medium flavor, more vapor Purple (3.4V) – Balanced flavor & vapor Red (3.8V) – Least flavor, max vapor Begin at lower temperatures for optimal flavor. Store away from heat and moisture