1. Battery powered: Powered by 3 x AAA batteries (not included). No worry about power loss and easy to use. After 30 minutes of playback, it automatically stops and enters standby. 2. Anxiety relief: Cute koala bear design suitable for babies and kids; a thoughtful gift. Multiple soothing modes help relieve tension, coax the baby to sleep, create a sense of security, and stop crying. 3. Multi music: 10 low-frequency music options and 5 white noise sounds (uterine amniotic fluid sound, soothing heartbeat, forest birdsong, spring night rain, gurgling stream) to relieve tension. 5 volume levels; default on power on is level 1, press once to increase. 4. With light: Soothing light with bionic sucking dynamics to release sleep signals and cultivate good sleep habits. Operation: first press turns on the soothing light, second press turns on the sucking dynamics, third press turns off the light. Use scenarios: - Bedtime at home to help baby fall asleep with soft light and soothing sounds. - Travel or on the go to keep the baby calm and comfortable. - Nighttime helper for toddlers or during babysitting to provide a comforting routine.