PRODUCT SPECIFICATIONS BT: V5.0 Support: L2CAP/A2DP(AVCTP/AVDTP/AVRCP), can receive AUDIO signal and control the AUDIO device.support HSP/HFP(Handsfree proflle), Bullt-in Mic for hands-free phone call Working distance: 10M SNR: 285db Battery:3.7V 500mAh Normal playing time: 2 H Speaker: 0 52 mm plus* 1, Power: 3W *1 Frequency response:120 Hz-20KHz Unit size: 123*46*81mm Unit weight: about 258g Charging: 5V/500mA PRODUCT FEATURE 1.Built-in Low-freq radiators,Super dynamic low-frequency sound preure gain, listening transparent and flexible. 2.With Hi-FI speaker, to make sure the clear and bright sound. 3.International advanced BT chip and circuit design tech-niques, support all BT device ;play music after pairing with BTdevice .for example mobile/MID/ TV, the working distance is more than 10M. 4.Support AUX IN audio input. 5.Bilt-in MP3 decoding, can directly play TF card, U disk,mobile and other USB storage devices stored MP3 format music files. 6.Build-in the FM radio module,convenient to auto scan and save radio channels. 7.With Mic for hands-free phone call function. 8.Support TWS. KEY AND SL OT FUNCTION: 1.USB slot: it can decode and play MP3 format audio when put USB card into the slot. 2.TF slot: it can decode and play MP3 format audio when put TF card into the slot. 3.Power switch. 4.DC 5V charging slot:use the standard mini USB micro charging cable for power charging./ AUX : it can play audio via 3.5mm AUX cable to audio device. 5.When play music(USB card 1 TF card/LINE IN/ FM/BT),pre short to switch USB/TF/ LINE IN/FM /BT. Keep the TWS speaker under BT mode without pairing ,pre theM".key for 3 seconds either of the speaker until hear a hint"du du"for TWS mode ,then can paire the mobile. 6.When play music , pre short for last song, pre long to turn down the volume. 7.When play music, pre short for next song, pre long to turn up the volume. 8.When play music(USB card/TF card/LINE IN/BT), pre short for "play/pause ". under BT mode with mobile paired,pre short to answer a call,pre again to hand up . in FM mode, pre short to search station automatically, pre again to stop searching). Note: Under FM mode, put in the AUX cable to get better FM radio station. .