ER2062B Features Standard 3.5 mm audio plug Superb sound effect Comes with blue backlight on the LCD screen Built-in rechargeable lithium battery Works with the audio devices containing a 3.5 mm port Main Features Model Frequency Response 87.5-108MHz Separation 60dB Battery Built-in 4.2V 130mAh lithium battery Working Time Up to 4 hours Plug 3.5 mm audio plug Compatibility iPhone， iPad， CD players， MP3/MP4 players， PDAs， tablet PCs， laptop PCs Screen Screen Size 0.7" Display Type LCD Package Details Weight: 53.50 g Size: 15.2*8*2 cm