DETAILSFeatures: 4-Channel Amplifier System Built-in Bluetooth for Wireless Audio Streaming FM Radio Tuner with Digital LCD Display Front Panel Button Control Center Audio Source Input Mode Selector Connect & Playback Audio from External Devices (2) 1/4 Microphone Input Jacks Built-in Microphone Talk-Over Function (MIC1 Only) MP3 Digital Audio File Support USB Flash Drive & SD Memory Card Readers Push-Type Speaker Connectors Aux (3.5mm) Input Jack REC + Subwoofer Output RCA (L/R) Connectors Audio Input RCA (L/R) Connectors Short Circuit & Over Voltage Protection Audio Configuration Settings: Treble Bass Master Volume Echo Mic Volume Convenient Audio Source Control for Home or Office Use Bluetooth Connectivity: Simple & Hassle-Free Pairing Instant Wireless Audio Streaming Ability Works with All of Today’s Latest Bluetooth Devices (iPhone Android Smartphone iPad Tablet PC etc.) Bluetooth Network Name: PYLEUSA Bluetooth Version: 4.0 Wireless Range: Up to 40’+ ft. What’s in the Box: Audio Amplifier Remote Control FM Antenna Technical Specs: Power Output: 500 Watt MAX Amplifier Design: 4-Channel Impedance: 4-8 Ohms Frequency Response: 20Hz - 20KHz Signal to Noise Ratio: >81dB T.H.D.: <0.3% Radio Station Memory: 30 Station Presets Digital File-type Compatibility: MP3 WMA Maximum USB/SD Flash Support: Up to 64GB Remote Control Battery: (1) x 3V Lithium Button Cell CR-2025 (Included) Power Cable Length: 4.2 ft. Power Supply: 110/220V Switchable Dimensions (L x W x H): 13.0’’ x 9.84’’ x 3.54’’ –inches Whats In The BoxAudio Amplifier Remote Control FM Antenna | Pyle | | Bluetooth Home Audio Source Amplifier | Black | Best Buy