ER2424B Features Hi-Fi stereo sound effect Backlit LCD screen for visual frequency adjustment Supports hands-free calling and music play Full frequency range (87.5-108.0MHz) Equipped with a 3.5 mm plug General Specs Brand & Model A13 FM Frequency Range 87.5Hz-108MHz Separation 60 dB  Battery Type Built-in 4.2V 130mA lithium battery Battery Run Time > 4 hours Package Details Weight: 54.57 g Size: 14.8*11.8*11.8 cm