HIFI 3.5mm EarAmplifier AMP For Mobile Phone

Type : Cell Phone Amplifier 
Material: Aluminium Alloy 
Color: Black 
Output Power: Maximum. 300 mw * 2/16 Ω 
Frequency Response: 2 - 27 KHz 
Signal-to-noise Ratio: 95 DB 
Dynamic Range: 90 DB 
Separation: 70 DB 
Distortion: ≤ 0.006% 
Input Impedance: 32Ω 
Output Impedance: ≤ 200Ω 
Working Temperature: - 40 °C - 60 °C
Storage Temperature: - 40 °C - 85 °C 
Storage Humidity: 10% - 90% 
Battery: Built-in lithium battery, 200mah (charged by Micro USB cable) 
Battery Life: 30 hours (approximately) 
Size: Approx. 68 * 25 * 10 mm / 2.7 * 1 * 0.4 inch (without wires) 
Battery protection: Yes 
Overcurrent protection: Yes 
Overpressure protection: Yes 
Short circuit protection: Yes