[ Design]Powered by USB 5V,built-in ceramic heating element at the mug bottom,heating speed is faster, 't burn your hands, when the mug is placed on the power base, the heating and heat preservation function is automatically activated,keep your drink perfectly hot about 55/131(with Lid). [Best Materials]The mug made of high quality food grade 304 stainless steel,sleek and rugged,Scratch ,easy to clean,mug lid with food-grade silicone sealing ring, maximum leakage and dustproof,you can put a straw or open to drink directly. [More Fashionable]Innovative light effects design, 7 colors LED indicator automatic gradual changing, give you a of vision,this mug's LED indicator tells you when your water is ready, warmer coffee easy even if you're in a dark night.Non slip silicone pad to make sure the mug warmer stable on desk,more considerate use. [Notes]This product does not contain a built-in battery, it needs to be connected to a charger to use it. It is recommended to use a 5V-2A,QC 3.0 or PD charger.This coffee mug is designed to keep your hot drinks warm, it would take a long time to heat up cold drinks Capacity: 300ml Input: DC 5V-2A Sleek, minimalist design with a compact, blue-light base. Made from double-layer food-grade 304 stainless steel, it's , rust-, and easy to clean. The built-in ceramic heating element in the bottom of the cup heats up quickly without burning your hands, keeping hot coffee, tea, milk, and more at around 55C (with lid). The base is powered by a 5V USB port and is waterproof and short-circuit-proof. The lid features a silicone seal for maximum leak and dust resistance. The sliding lid allows for a straw or can be opened for direct drinking. Color: White Material: 304 Stainless Steel Package Contents: 1 x Heated Mug 1 x Cup Lid 1 Base Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.