Feature: 1. Intelligent Noise Reduction: The dual alarm clock has intelligent noise reduction function, which does not delay, which can meet your daily use needs 2. Compact Body: The alarm clock with speaker has a compact body and is a work of art at home and office 3. 45MM Loudspeaker: The digital alarm clock with 45MM loudspeaker, strong sound, built in HD clear call microphone 4. Convenient and Practical: The digital dual alarm clock is not only a speaker, but also a real time alarm clock, with multi function operation for easy use 5. 3 Level Brightness: The alarm clock has 3 level brightness adjustment. When USB charging, the screen can be set to be always on, and will automatically turn to the darkest in 5 minutes when is not connected Specification: Item Type: Alarm Clock Material: ABS Battery Type: Lithium Battery (shipped with built in battery) Battery Type: 18650 Battery Capacity: 2000mAh Speakers: 2 BT Name: BT501 Playing Time: 32H Effective Distance: Approx. 10meters/10.9yd (barrier free) Standby Time: 98h (three levels of screen brightness) Support Calls: Yes Voice Frequency Interface: 3.5mm/0.1in Voice Frequency Expanded Storage: 32GB Connection Method: BT Connection Speaker Power: 4Ω 3W Charging Time: 2 to 3 H Input Voltage: 5V 1A Product Size: Approx. 4.5 x 6.5 x 14.1cm / 1.8 x 2.6 x 5.6in. Package List: 1 x Alarm Clock 1 x User Manual2 x Wires Note: Shipped with Built in Battery