Audio format: Supports MP3, WAV, APE Bluetooth function: Supports pairing with external Bluetooth devices such as mobile phones for audio playback External sound input: Supports external input to the unit with amplified output Memory card function: Supports external TF card, up to 32GB USB function: Connect USB drive (supports up to 32GB) to play music; ideal for setting up a home background music system Volume adjustment: 15-level electronic volume control Power-off memory function: Remembers the playback state prior to the last shutdown Power: AC 110V250V (50Hz) Impedance: 48 ohms Output power: 2x25W Audio signal-to-noise ratio: 98dB Frequency response: 20Hz20kHz Infrared remote control distance: Up to 10 meters Bluetooth range: Up to 10 meters Installation: Compatible with 86 standard wall box Color: Black Material: Plastic and metal Package contents: 1 x Audio wall amplifier 1 x Installation box 1 x Installation bracket 1 x Set of installation screws Note: The package includes only the items listed above. Other items are not included. Note: Lighting effects and display differences may cause slight variations in color between the product image and the actual item. Measurement allows an error of +/- 13 cm.