Features1、 professional-in-one wireless Bluetooth speakers、 easy to operate.2、 Bluetooth V2.1 + EDR function BK programs.3、 Set the charging / audio input to an interface、 the product looks more concise.4、 built-read high-capacity TF card reader can read all memory cards 64GB or less.6、 high-quality sound effects、 signal to noise ratio can reach more than 90DB.7、 remote control function (mode conversion、 play / pause; volume addition and subtraction、 set-in-one)8、 low power consumption、 use a class D amplifier、 long playback time、 the Bluetooth standby current of less than 20mA.Weight:63gSize: 180mm (h) * 50mm (φ)Bluetooth specification: BK Bluetooth chip + JL (Jerry reader master); Bluetooth version: Bluet00th V2.1 + EDRBluetooth protocol: OPP、 OBEX、 SPP、 A2DP、 AVRCP、 FTP、 HSP、 DUN、 PROFILESWireless transmission range: <10MSensitivity:-90dbm0.1%BER