One button to lock & Volume Limit?This mp3 player has one separate button to lock screen. It can avoid children’s unexpected operation. To protect kids hearing, this toddler MP3 Music Player has volume limit function. Parents can set up maximum volume for kids. Parents will not worry about hurting kids hearing. HiFi lossless sound & Multi-functional Bluetooth Music Player ?This kids Bluetooth Music Player supports MP3,WMA,WAV,FLAC and APE hifi lossless music playback and also has different repeat modes, variable speed playback. The more functions include FM Radio (headphone is required as receiving antenna), voice Recorder, puzzle games, alarm, photo viewer, stopwatch, sleep timer and file browser. 64GB Internal Storage & Large Battery Capacity?This Bluetooth MP3 Player is built in 64GB internal storage and supports Micro SD card up to 128GB (not included).You can store more songs or audiobooks. The large rechargeable battery can play about 80hrs of music with wired headphone (middle volume); 28hrs of Bluetooth connection and 20hrs of FM radio. The kids can enjoy song playback without worrying about running out of power. Bluetooth 5.3, Front Speaker & Line-in function? The latest Bluetooth 5.3 chipset can be connected faster and more stable. It is just a Bluetooth transmitter, not a receiver, it cannot pair with phones. The front speaker is louder with better sound. This line-in function is easy to record your favorite audio files into this mp3 player from your mobile phone (3.5mm port), other mp3 players, CD player and computer. Cute Cartoon Design with Ears Lighting up?BluKaSa Bluetooth Kids MP3 Player is designed with 7 lovely front buttons and light ears. The ears can flicker with blue light(three LED light modes). Kids can enjoy music anytime with lanyard, carried around neck as companion. MP3 player is lightweight, compact & well-made, perfect for kids little hands. Parties in Birthday, Festival, Christmas, holiday, this Music Player is a great gift for children.