Specifications:Stylish card Bluetooth speakers, not only high-grade, but also durable to use.Support TF card automatic playback.Support audio output, can be connected to computers, mobile phones, MP3 and other audio interface.Small body, big capacity, large volume, high powerful.Portable mini size design, you can easy to enjoy the music anytime, anywhere.Type: Mini Bluetooth SpeakerBluetooth Version: Bluetooth 2.1Case Material: ABSInterface Type: USBAudio Interface: 3.5mmVoltage: DC 5VOutput Power: 3WDistortion Rate: 0.5%@ (1KHz)Frequency: 90Hz - 20KHzImpedance: 4 ohmTransmission Range: up to 10mBattery Capacity: 350mAPlay Time: 2 - 3 HoursSignal To Noise Ratio: ≥ 80dBPower Supply: 3.7V 400mA Built in Lithium Battery (Included)Mode Of Operation: KeyPlay Format: WAV, MP3, WMAFormat: Support TF CardAudio Input: Bluetooth, USB, TF Card, AUX: Bluetooth Audio Input, TF Card, Mini, Portable, LED Light, Crack Pattern Case, USB InterfaceSize: 5.5cm x 5.5cm x 6cm/2.17" x 2.17" x 2.36" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.