... ,check details at our homepage 2.3 Operating voltage ,AC220V±15%,50Hz2.4 operating current , 50mA,≤0.2A. 2.5 frequency ... impedance ,1KΩ2.8 distortion factor ,≤2%2.9 Output power amplification ,0~35W (load impedance 16Ω)3.0 Installed ,wall ... Using the integrated design concept with basic conversations, Noise resection, power amplifier, power circuit and protecting circuits etc in a phone,. well-known ...