A pair of glasses are included - so you can share. Automatic filling, instant heat-up, and dishwasher safe glass. 510 thread compatibility, concentrates, herb. 4 Heat settings 2.5 V, 3.0V, 3.5V, 4.0V 1x Zenco DUO 2x Glasses 2x Vapor Coils 1x USB Charger Concentrate Scoop, cleaning brush Removable Food-Grade Silicone Diffuser ( All Zenco glassware is interchangeable ) 1 Year Limited Warranty through Zenco Company