1. Charging Duration: It Takes Approximately 1.5 Hours For The Product To Fully Charge. 2. After Fully , Low Brightness Lights Last For About 24 Hours, And High Brightness Lights Last For About 3-5 Hours. 3. When Charging, The Red Light Remains On, And When Fully , The Green Light Remains On. 4. Key On: The First Is For The Cold White Light, The Second Is For The Warm Yellow Light, The Third Is For The Warm White Light, And The Fourth Is To Turn Off The Light. 5. Key On: The First Is For The Cold White Light, The Second Is For The Warm Yellow Light, The Third Is For The Warm White Light, And The Fourth Is To Turn Off The Light. Description: 1. Product Model: C15 2. Battery Capacity: 400mAh Polymer Lithium Battery, Equipped With 25cm USB Type-C Cable 3. Function: Night Light, Ambient Light, Clip Light, With Stepless Dimming Colour:Black Material:ABS+PVC Size: About 4.6x1.73x8cm Package Contents: 1x Desk Lamp 1x Charging Cable 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.