Features:HIFI sound qualityLossless decodingHD recordingIntelligent noise reduction, ultra clear playbackEasy to carry, suitable for listening to music while exercisingSupport connection to computer or mobile phone to download music4G can store about 400 songs; 8G can store about 800 songs; 16G can store about 1600 songs; 32G can store about 3200 songs;Long battery life for 20 hours, built-in large-capacity lithium battery, fully charged for about 20 hours;Product brand: HBNKHModel: H-R310Recording format: WAVAudio format: MP3/WAV/APE/FLACPlay time: 20 hours or soCharging time: 60 minutesConnection method: USB 2.0 interface, support USB 3.0Storage capacity: 4GB/8GB/16GB/32GBPower supply: 150mAh polymer lithium batteryHeadphone output: 2-channel stereo headphones 32ohmSignal to noise ratio: >88dbFrequency response: 20Hz-20kHzSize: 46 x 44 x 11mmPackage Included:1 x MP31 x Earphone1 x USB Charging Cable1 x User Manual