Specifications:Bluetooth wireless transmission, support for hands-free calls.Support the TF card automatic playback function.Support computers, mobile phones, MP3 players and other audio interface.Type: bluetooth-compatible SpeakerMaterial: ABSSNR: 80 (db)Impedance: 4 ()Distance: 10metersRated Voltage: 5 (V)Rated Power: 3 (W)Bluetooth Version: 2.1Audio Interface: 3.5mmFrequency: 2402 - 2480MHzRated Frequency: 90Hz - 20KHzPlaying Time: About 1 HourExpand TF Card: 32GB (Not Included)Speaker Type: Portable SpeakerPower Supply: DC 5V, 300mAH Built-in Li-ion BatteryFeatures: Portable, Mini, Useful, Wireless, bluetooth-compatible Audio Input, bluetooth-compatible Hands-free Calls, LED LightSize: 6.1cm x 6.1cm x 6.2cm/2.40" x 2.40" x 2.44" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x bluetooth-compatible Speaker1 x 2 In 1 Audio USB Charging Cable