Memory card type: expansion card is not supportedModel: S12Screen size: 1.1 inchesGift use: points redeemed for gifts, business gifts, advertising gifts, promotional gifts, conference gifts, festive gifts, commendation gifts, public relations gifts, personal giftsScreen resolution: 160128Interface: Mini USBHeadphone jack: two-wayAdditional features: watch function, support bluetooth, recording function, e-book reading, head-mounted MP3Menu language: Chinese supports 24 languagesBattery type: lithium batteryMemory capacity: 4GB, 8GB, 16GB, 32GBSupported audio formats: WMA, WAVApplicable people: students, music enthusiasts, teachers, trainers, business people, public security personnel, lawyers, journalists, public figures, young caregiversExpansion card: not supportedBattery capacity: 180mAhOperation mode: touchAttribute 1: mp3Attribute 2: BluetoothProduct size: dial: 1.3*2.6*4.5cm table full length: 25.5cmBattery life: 15Screen color: OLED screen