ER2241B Highlights Features an automatic searching function Dual-channel high-fidelity stereo sound effects Automatically finds the clearest frequency Features a stored memory function Can also function as a car charger to charge your Apple devices General Specs Output Voltage 5V ± 0.3V Output Current 2100 mA Transmitting Distance < 5 m Frequency Response 20Hz-20KHz Separation ≥ 35 dB S/N Ratio ≥ 60 dB Operating Current 25 mA ± 5mA Operating Temperature -10°C-40°C Storage Temperature -20°C-50°C Package Details Weight: 99.51 g Size: 21*11.5*3.5 cm