... , GB3836.3-2000,GB3836.4-2000.2.2 Anti-explosion mark ,check details at our homepage 2.3 Operating voltage ,AC220V ... 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 ...