This double wall borosilicate glass bottle can hold both hot and colddrinks. Unlike regular glass, this will not crack under extremetemperature changes. On the inside is a removable tea infuser/strainerto help infuse the water with your favourite fruit flavour or tea. Thetop of the lid has a built-in LED touch thermometer that shows thecurrent temperature of the liquid inside. Never burn your lips on hottea again with this bottle. Take this bottle with you wherever you go.It is leakproof, so you will have no trouble carrying it in your bag. 1CR 2450 battery included. Capacity: 390ml. Laser engraving is notpossible on borosilicate glass.