Built-in 1000 mAh rechargeable lithium battery, no need to insert batteries for use. When fully charged, it can play at maximum volume for approximately 6 hours, with a standby time of about 48 hours. Easily charged via USB cable; full charge in 2-3 hours. Three-level brightness LED display offers adjustable brightness settings, allowing comfortable night-time use and reducing eye strain. Equipped with FM radio and Bluetooth 5.0 speaker for fast pairing with all Bluetooth-enabled devices. Clear sound output with volume control. Simple interface for FM radio operation. Dual alarm function allows two independent alarms to be set. Alarm volume increases gradually to gently wake you. Supports 12/24 hour time format switching (double-click "M" button). LED display provides clear time visibility. Dimmable screen for enhanced viewing in different lighting conditions. Color: silver-white Material: plastic Size: 116 x 51 x 33mm Package Contents: 1 x Digital Alarm Clock 1 x USB Cable Note: Only the items listed are included. Light reflection and differences in display screens may cause slight variations in color appearance. Measurement allows an error of +/- 1-3 cm.