Feature:1. Can transmit music from mobile phone, tablet PC or other BT-enabled audio devices to your speakers via BT connection, no wire needed. Transmission range is up to 30 feet.2. Simple and convenient to select AUX IN mode and BT / USB Reader mode with one switch. Freely to control volume with a volume control knob.3. The output power of this digital audio power amplifier is 50W + 50W, dual-channel output. Left and right channel negative pole cannot be connected.4. Adopts the professional high-quality WIMA MKP10 capacitor; Using large capacity 1000uf high-frequency low resistance output capacitor, giving you amazing HiFi music.5. High-quality aluminum alloy case, gold-plated input and output interface, exquisite and durable.Specification:Features:Can transmit music from mobile phone, tablet PC or other BT-enabled audio devices to your speakers via BT connection, no wire needed. Transmission range is up to 30 feet.Simple and convenient to select AUX IN mode and BT / USB Reader mode with one switch. Freely to control volume with a volume control knob.The output power of this digital audio power amplifier is 50W + 50W, dual-channel output. Left and right channel negative pole cannot be connected.Adopts the professional high-quality WIMA MKP10 capacitor; Using large capacity 1000uf high-frequency low resistance output capacitor, giving you amazing HiFi music.High-quality aluminum alloy case, gold-plated input and output interface, exquisite and durable.Specifications:Model Number: NK-368RBT: 4.0BT Effective Range: about 10 metersChannel: 2.0Output Power: max. 50W * 2SNR: ≥80dBSensitivity: 750mVT.H.D: ≤0.1%1kHzFrequency Response: 20Hz-22KHzPower Supply: Input--100-240V 50/60Hz, output--19V 3.42AMaterial: Aluminum AlloyColor: Silver, Black (Optional)Item Size: 12 * 9.5 * 3cm / 4.7 * 3.7 * 1.2inItem Weight: 337g / 11.88ozPackage Size: 24.5 * 18.6 * 6.7cm / 9.64 * 7.32 * 2.63inPackage Weight: 768g / 27.09ozPackage List:1 * Amplifier1 * Power Adapter1 * AC CablePackage List:1 * Amplifier1 * Power Adapter1 * AC Cable