Features: brand new and high quality Using CSR8635 Bt chip, Bt V4.2, high software compatibility. TDA7492 digital power amplifier chip, specially designed for optimized circuit layout, with very good sound quality and high power. DIP switches can be adjusted directly after the amp gains more respect, better promoting larger damped horns. Output Impedance: 8 ohms best (4, 6, 8, 16 ohms can drive speakers). Output power: add 5532 front output pins (power supply 25V, 6 ohm impedance output 2 X 50W,8 ohm impedance output 2X40W dual channel). Specifications: Power supply voltage: 2.1 interface for DC 7-26V (with power reverse connection for protection) Bt version: V4.0 Bt name: HW-BT893 Output channel: two-channel stereo Output power: 2x30W Output impedance: 8 (can drive 4, 6, 8, 16 impedance speakers) Material: Metal Color: As the Picture Shows Product Dimension: approx. 7x3x2cm/2.76x1.18x0.79inches Net Weight: 65g/0.14lbs Note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x TDA7492P Dual Channel Digital Power Amplifier Board