1. Bluetooth 5.0 version provides higher transmission efficiency and a transmission distance of up to 15 meters (without obstruction). 2. Heat sink design ensures efficient heat dissipation. 3. Equipped with a potentiometer to adjust volume and an on/off switch for easy control, suitable for DIY speaker applications. If used in a metal enclosure, ensure the Bluetooth antenna is properly extended. 4. Features a copper DC connector designed to handle high current with minimal heat generation. 5. Includes 4 x 470uF capacitors to ensure stable power storage and continuous power supply, supporting high-quality audio performance. 6. DC power input with cable allows compatibility with standard power adapters. Even without a dedicated DC adapter or battery, the unit can be powered via compatible sources. Power Supply Voltage: 524V (compatible with 9V, 12V, 15V, 18V, or 24V adapters; higher voltage recommended) Output Power: - 12V: 24W + 24W (8 ohm), 40W + 40W (4 ohm) - 15V: 32W + 32W (8 ohm), 60W + 60W (4 ohm) - 19V: 64W + 64W (8 ohm), 80W + 80W (4 ohm) - 24V: 72W + 72W (8 ohm), 100W + 100W (4 ohm) Product Name: HIFI Bluetooth Digital Power Amplifier Board with Filter 2X100W Model: -1002L Chip Solution: Standard With Filter: Yes Compatible Speakers: 50W300W, 4 ohm8 ohm Channels: Stereo (Left and Right) Bluetooth Version: 5.0 Bluetooth Range: 15 meters (unobstructed) Protection Features: Overheating protection, short circuit protection Color: Black Material: Metal + PC Package Contents: 1 x Bluetooth 5.0 Digital Amplifier Board 1 x Shell 1 x Screwdriver 1 x Power Cord Note: The power switch on the board is a standby switch. When turned off, the device enters a low-power standby mode. To completely disconnect power, remove the DC plug. Tip: Optimal output power requires sufficient audio input and adequate power supply voltage/current. Higher supply voltage results in increased output power. Output power varies with speaker impedance. With sufficient voltage and current, higher impedance speakers will produce relatively lower output power. Contents limited to items listed above; other accessories not included. Note: Lighting and display differences may cause slight color variations between the image and the actual product. Measurement tolerance: 13 cm.