Improved version, more functions: the updated rotating music box mobile is a perfect gift for babies under 5 years. This new musical baby phone has four buttons for more functions: play/pause, single song/loop playlist, previous/next track, volume control, music/rotation separation rotation stops - you can adjust the sound to silently via the volume). Easy to use and convenient to use. Equipped with 35 melodies. You can also download other audios, such as audio stories, into this music phone via USB cable (cable included, you don't need to pull out the card when downloading audios, just plug and download it). Supports most audio formats such as MP3, WAV, WMV. Best gift for babies and children: this mobile bed bell music box for baby beds plays light music so your baby can easily fall asleep. Music plays a crucial role in developing your baby's brain to learn. Listening to music helps your child learn patterns, sequences, rhythms, beats and sounds that are useful for problem solving and thinking. Early music recordings can include critical listening skills, language, literacy, creativity and coordination. Safety guarantee: This musical baby bell is made of environmentally friendly and durable ABS material to ensure the safety of the baby when biting. You can attach this musical baby mobile to a cot with arms or clips and then hang toys over the hook of the musical mobile (clip and toys are not included) Save energy: this musical baby mobile is powered by only 2 AA batteries (not included). If no micro SD card is detected, this baby music box will automatically turn off one minute later to save energy. Battery protection. When you connect this baby music box to your computer via a USB cable to download music, the batteries will not be charged via a USB cable, which protects the batteries from damage.