Features:
1. Small but mighty - a perfect travelling noise machine for baby on-the-go and adult
2. Built in 11 soothing sounds(9 natural sounds, white noise,fan sound)
3. True portable  - built in 1200mA battery, 12-15hours standby time 
4. Help settle-in & stay asleep - create peaceful sleep environment 
5. Built-in Auto-off timer 30-60-90 minutes and continual play
6. Speaker Spec: 40mm 2 ohm 3W
7. Frequency response: 60HZ - 20KHZ
8. Product size: D100*H35mm
9. Product Certificates: CE, ROHS, FCC, MSDS, UN38.3