PRODUCT SPECIFICATIONS: Wirele: V5.3 Support: L2CAP/A2DP(AVCTP/AVDTP/AVRCP), to receive stereo audio signal, can control the audio transmitter and up and down operation through the agreement;support HSP I HFP (Handsfree profile), with hands-free function,Can communicate with people. Working distance: 10M SNR:290db Battery: 1200mAh Built-in voltage: 3.7V Normal volume playing time:3H Speaker driver: 52mm*2 Power.5W *2 Frequency response:1 50HZ-20KHZ Unit size:80*80*180mm Unit weight:557g Charging: 5V/500mA 1.International advanced wirele chip and circuit design techniques,support wirele devices. 2.With FM function, can search radio station broadcast automatically 3.With Hi-Fi speaker, to make sure the clear and bright sound. 4.Support Micro SD card and USB card, play MP3 format audio. 5.The wirele working distance is 10 meters. 6.With AUX line in, can directly connect the outside devices, for example, tablet PC/TV/cell phones. 7.it will close automatically if disconnect Wirele for 30 mins. 8.Support TWS. Instructions for use 1.DC 5V slot, (standard Micro USB V8 charging cable for power charging) 2.TF slot: It can decode and play MP3 format audio when put TF card into the slot. 3.USB slot: It can decode and play MP3 format audio when put the USB card into the slot. 4.LINE IN slot: Use the Mini 3.5 head input through outside devices. 5.When play music, Pre short for last song, long pre to turn down the volume. 6.When play music, pre short for next song, long pre to tum up the volume. 7.When play music,(USB card/TF card/Wirele/line in/FM)short pre to swith model.Keep the TWS speaker under Wirele mode without pairing with mobile, ,pre the M" key for 3 seconds either of the speaker until hear a hint"du du du" for TWS mode ,then can paire the mobile. 8.Pre long for power on /power off. When play music,(USB card/TF card/Wirele), short pre for "play/pause". In FM mode, pre short to search station automatically,pre again to stop searching. Under wirele mode with mobile paired,when call coming,pre short to answer a call hands-free,pre again to hand up,pre twice to ring up a call. NOTE: In the FM mode, put in micro charging cable to get better FM radio station. USB DISK/ TF CARD should be format FAT32 .