Feature: 1. Full Size Display: The digital wireless alarm clock has a full size high definition display with bright LED backlight 2. 3 Levels Brightness: The FM alarm clock speakers can be used as BT speakers and digital alarm clocks, with three levels of brightness adjustment 3. Mobile Phone Charging: The digital radio clock has the function of wireless mobile phone charging, and also has the sound effect of stereo bass 4. HD Microphone: The LED digital alarm clock has a built in 2000mAh high capacity lithium battery. Built in high definition microphone to answer phone calls 5. FM Radio: The wireless alarm clock has built in FM radio, can play BT 4.2, memory card play, AUX input Specification: Item Type: Digital Wireless Alarm Clock Material: ABS Battery Type: Lithium Battery (shipped with built in battery) Battery Model: 18650 Battery Capacity: 2000mAh Working Time: About 6 Hours (medium volume) Speaker Size: Φ45mm/1.8in Output Power: 5W Connection Method: BT Connection Effective Distance: 10meters/10.9yd Charging Time: 2 to 3 Hours Frequency Response Range: 280HZ to 16KHz Supported Formats: Memory Card Function: FM Radio, Mobile Phone Wireless Charging, Aux Voice Frequency, Memory Card, BT Connection. Package List: 1 x Digital Wireless Alarm Clock2 x Cables1 x User Manual Note: Shipped with Built in Battery