Features: M01BT with PBTL/SUB switches, SUB modse can be used as a subwoofer amplifier for connecting passive subwoofers and active subwoofers, PBTL modes is used as a full-ranges mono amplifier for connecting passive speakers. Features SUB frequency control, gain control and volume control. You can set the control to get the clear sound quality you want with high fidelities. Maximums output power 300watt: compact mini audios amplifier class D. The SUB amplifier uses the high-performances chip TDA7498E with a maximums output power of 300watts. It can easily control passive speakers with more than 300watts making it the perfect solution for outdoor/bookshelves/computer/desktop/ceiling/floor standing speakers. Supports stereo RCAand Blue tooth5.0 inputs: works with mobile phones, computers, TVs, MP3 players, TVs, Dot, CDs players, etc. Suitable for most active subwoofers and passive speakers/subwoofers at home. Blue tooth transmission ranges up to 50FT (Note: M01BT is not suitable for use with active speakers). A simple home or desktop sounds system can be easily set up with the M01BT. The amplification setting provides more variability in the sound: With the 4 adjustment levels - 35dB, 40dB, 43dB and 46dB - you can adjust the gain setting to your speakers for the best sounds. Small and compact case with sophisticated look: the full aluminum housing is compact and space-saving, so you can use it at home, outdoors or in office. Specifications: Material: aluminum alloy Size: approx 30x120x120mm/1.18x4.72x4.72inch Standard: UK/EU/Austrilia/US(optional) Note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xSubwoofer Amplifier 1x24V Power Supply Adapter