Product information: Screen size: no display (inches)Memory card type: TF cardExpansion card: not supportedMode of operation: push-buttonInterface: USB 2.0Headphone jack: All-in-oneSupport audio formats: MP3, WMA, WAV, FLAC, APEScreen color: NoneFrequency response range: 20-20KHZMenu language: no screenAdditional features: support Bluetooth, head-mounted MP3Battery type: Lithium batteryBattery capacity: 170MALife time: 5-7 (hours)Weight: 32 (g)Packing list: host + USB cable + adjustment belt + manualBody color: white, black, blue and black, blue and whiteMemory capacity: comes with 4GBMP3 + Bluetooth, comes with 8GBMP3 + Bluetooth, comes with 16GBMP3 + Bluetooth, 4GB without Bluetooth, 8GB without Bluetooth, 16GB without BluetoothPacking: 8GB＋Bluetooth, 16GB＋Bluetooth,Earphone x1