Usage Tips:Features: Function: LED display, snooze, alarm clock, dual USB output, power-off memory, automatic dimming, night light, vibration reminder. Compatibility: Dual USB output supports iPhone, Android phones, and various USB-powered devices. Brightness adjustment of the electronic clock: Uses a high-sensitivity photosensitive sensor to automatically adjust display brightness based on ambient light; manual brightness settings with three levels: high, medium, and low. Night light brightness: manual four-level brightness adjustment. Memory function: Built-in CR2016 button battery retains time and settings when external power is disconnected. Power supply mode: External 5V1A–5V2A DC power supply; standard shipment includes only a 1.5m DC power cable (adapter not included). Specifications: Material: ABS Electronic Clock: 158x55x87mm / 6.22x2.16x3.42inch Vibrator: 80x80x28.8mm / 3.14x3.14x1.13inch Note: 1. Please allow 1–2cm measurement deviation due to manual measurement. Ensure you are comfortable with this before ordering. 2. Due to differences in monitor displays, the image may not reflect the actual color of the item. Thank you for your understanding. Package includes: 1 x Electronic Clock 1 x Vibrator 1 x English Manual 1 x 1.5m USB Cable 1 x CR2016 Button Battery (with insulation)