Model: U-50/VP-50A/60A/90A/100A/160A/180A/250A/350A/500A/700A 
With USB interface, support U disk player; 
Built-in radio function, automatic station search, automatic storage units (U-50, VP-50A, VP-90A does not have this feature); 
Built-in infrared receiver function, remote control (U-50, VP-50A, VP-90A does not have this feature works); 
2LINE input, 3MIC input, 1LINE output; 
4 partitions switch selection button; 
The level of a single independent regulator, the volume adjusted independently for each input; 
Smart short circuit overheating protection.