Connection: Bluetooth connectivityInterface Type: USBFrequency range: 40Hz-20KHzSNR: －70dbPower supply: built-in lithium batteryChannel: 2.1Extensible Storage: 16GBEffective distance: 10 metersFunction: calls、 cards、 voice prompts、 RadioOperating mode: the keyPlayback Formats: MP3Enclosure Type:Whether to support APP: NoSupported formats: TF cardSpeaker adjustment mode: the keyIs there a radio function: YesCase Material: PlasticWeight: 0.2 (KG)Color: green、 pink、 blue、 white、 yellowRegular Shipping to Countries: 12-40 days. Please take this into consideration! If the package hasn¨t been delivered in 45 days、 please contact me、 I will check it for you.