... batteries needed This item is fixed with LED Under the lid. No batteries required, charged by solar energy, it ... : 600 ml; Weight: 179g. Materials: Cup made of Imported AS resin, the lid made of Thermoplastic ABS resin. LED: 3LEDs ... 3.5-4 hours. 3. Open the lid, and insert the lid along the screw thread, it can be ... read-lamp, there must be some Water in the cup to balance it) 4. The red light can flash ...