Item Type: MP3 PlayerMaterial: PlasticProduct Size: Approx. 9x4x1cm / 3.54x1.57x0.39inBattery Type: Polymer BatteryBattery Capacity: 450mahNote: Shipped With Built In Battery, Shipped With Memory Card (Already Installed On Top Of The Product)Package List1 x MP3 Player1 x USB Data Cable1 x Instruction ManualPlease allow some error due to manual measurement.1DICTIONARY FUNCTION: MP3 music player is equipped with English dictionary function and English phonetic transcription to enhance English strength. 2HIFI SOUND QUALITY: MP4 player has HIFI sound quality, external playback and Bluetooth switching freely, which can give high definition music experience. 3STABLE CONNECTION: MP3 player connects faster and more stable, and can be connected to a variety of devices such as Bluetooth headphones and Bluetooth speakers. 4NOISE CANCELLATION: HiFi MP3 player uses high power external speaker with professional intelligent digital noise reduction chip for more clarity. 5SMALL AND LIGHTWEIGHT: Bluetooth MP4 player is small and lightweight, no weight, very easy to carry, almost can not feel the weight.