Sunnice&reg; Brand New KG52 KG5012 wireless bluetooth folding stereo earphone headphone headset, heavy bass headphones, with microphone for smartphone tablet iPad computer, handsfree headset Sport mp3 Player Surpport SD/TF Card FM Radio Function (TF card NOT included) , Compatible with all Bluetooth enabled devices(Black & Golden) All the bell type ear cover design, effectively isolate external noise, wear comfortable at the same time bring the perfect music experience. High protein cortical earmuffs with high elastic memory foam, soft ears, comfortable, breathable, long wear also won't have hot feeling. Of human body engineering design, scalable manganese steel head liang earmuffs, universal adaptive rotor design, the integrated use of a variety of ingenious design, greatly reduce the pressure of the headset to the head, to ensure the long time wearing comfortable Adopts advanced bluetooth wireless technology mature, stable receive 10 meters scope, support wireless listening to music, make/receive phone, easy to use Functions: 1. Bluetooth function:Press on "M" key to enter bluetooth mode. Blue and green light flash alternately. Headset bluetooth start to wait for connection. Start cellphone bluetooth to set and choose search, it will pop up "such as KG52" to match connection. When it connects successfully, green light flash. Then you can choose music to play. (Part of cellphone connection need to input password "0000") 2. TF card play: Insert TF card into earphone slot. Press "M" to switch read card mode, green light flash and the system can decode audio format file you want to play. Then you can listen to music. 3. FM radio: Press "M" to switch to radio mode. If you hear hiss, it proves no radio station. Press "Play" for a while, headset will search radio programs automatically. You can also achieve that by pressing on " +/-" for a moment. 4. Charging: Please power headset off before charging. Connect headset with computer USB port with charging cable. When headset lightens red, it proves successful connection and is being charged. When light is off automatically, it proves full charge. (Built-in battery of headset has protection function.)