2 x LINE IN INPUT - Dual RCA inputs for connecting to two devices simultaneously. Built-in Class-D amplifier with 21W+21W RMS power output. EASY OPERATION - The side panel features the bass, treble, and volume controls. Of course, a remote control is also included. DIGITAL CHIP AND POWERFUL TWEETER - These speakers feature a TI PCM9211 digital decoding chip that accurately reproduces the source audio. The built-in tweeter is no less than 25 mm. UNIQUE STYLE - MDF wooden enclosure to minimize acoustic resonance. Classic acoustic configuration with 1-inch (25mm) tweeter and 4-inch (116mm) mid-bass driver. 2 YEAR WARRANTY - Guaranteed high quality and reliability with hassle-free parts and labor warranty for two years in USA and Canada.