Material: ABS and silicone Voltage input: DC5V=0.5A Power: 1W Battery capacity: 300mAh Use time: 23 hours (measured about 36h) Charging time: 1 hour Product size: about 93*80*28mm/3.66*3.15*1.10inch Packing size: about 158*106*31mm/6.22*4.17*1.22inch meter function: 1. 10 sleep-aid music: white noise, lullaby 1, cricket call, sea wave, clock, bird call, heartbeat, lullaby 2, running water sound, lullaby 3. 2. Timing function: 15min (green light) / 30min (green, blue light) / 60min (green light, blue light and red light) can be timed to avoid forgetting to turn off when you fall asleep. 3. Automatic noise detection button: without power on, long press for 2 seconds to enter the noise detection for 10 seconds, turn on the music for 15 minutes and then stop, loop detection, detection distance 6-10 meters. 4. Charging instructions: green, blue and red indicator lights show that the power is 30%/70%/100%. 5. Small and mini, with lanyard for delivery, easy to carry and use.