F eature: Three b rightness Three-step brightness adjustment, you can flexibly adjust the display brightness according to your own habits, and accompany you to sleep peacefully. Custom dual alarm clock The desktop displays the time, you can use it to determine the time, the built-in personalized alarm clock function, you can set multiple dual alarms. 360 degree surround With strong magnetic speakers, powerful stereo bass, 360-degree surround, clear and powerful drums, and good sound. Various  playback modes You can play via Bluetooth connection, card playback, radio playback, can meet your needs. High capacity With two large-capacity rechargeable batteries (included), the maximum standby time is about 200 hours, which is energy-saving.   Specifications : Item type: Alarm clock Material: Plastic + electronic components Color: Black Product model: B119 Peak power: 5W Connection method: Bluetooth connection Interface: USB Frequency response range: 150HZ-20KHZ Output power: 3W Signal to noise ratio: More than 75DB Battery capacity: 1200mAh Power supply: Built-in 2*1200mAh lithium battery Channel: 2.1 Playing time: 48h Extended storage: Not supported Bluetooth protocol: 5.0 Number of speakers: 1 Effective distance: 10 meters/393inch Operation mode: Button Play format: MP3 Speaker adjustment method: Button Radio function: Yes Input voltage: 5V Input current: 1A Bluetooth device name: ASMB119 Speaker full frequency/diaphragm specification: 40mm/1.57inch*1 full frequency Charging power supply: DC5V Voltage: 3.7V Output power: 3W*1 RMS Distortion: 2-5percent Input sensitivity: 600MV Connection distance: 10-20 meters/393-786inch (without obstacles) Item size: 14.3*3.3*4.6cm/5.5*1.3*1.81inch(L*W*H) Weight: 240g/8.47oz 360 degree surround: With strong magnetic speakers, powerful stereo bass, 360-degree surround, clear and powerful drums, and good sound. Custom dual alarm clock: The desktop displays the time, you can use it to determine the time, the built-in personalized alarm clock function, you can set multiple dual alarms. Various playback modes: You can play via Bluetooth connection, card playback, radio playback, can meet your needs. High capacity: With two large-capacity rechargeable batteries (included), the maximum standby time is about 200 hours, which is energy-saving. Three brightness: Three-step brightness adjustment, you can flexibly adjust the display brightness according to your own habits, and accompany you to sleep peacefully.