Functionality: Effective non-spill valve. Cup rim helps to ease the bottle / spouted sippy cup transition. Important for long term oral health. 360 degree cup edge means you can drink from anywhere round the rim. No straws or spouts which can be used for comfort sucking. Free flow natural drinking started by a small suck. Light and robust for everyday use. Great for travel and/or camping. The night-light means you never lose your cup at night! Light sensitive - No need to worry about turning it on or off. Night-light battery and LED bulb are encased in a litepack that can click in or out of the base. Manually switched off to save on battery life. Litecup holds 330mls of a non-carbonated liquid. Little litecup holds 220mls of a non-carbonated liquid. Easy to clean.