Shanghai Shenda Sound Electronic Co. Ltd is Chattery International Inc. U.S.A. wholly-owned factories. Owned audio equipment set up only in 1996 in mainland China manufacturing plant. Professional audio electronic tube products research and development and production base. Have JOLIDA global brand ownership. Jolida developed a variety of high fidelity electronic tube power amplifier and the hybrid power amplifier. Product audio quality clear smooth, full of boundless energy. Very real music scene.