Dynamic Microphone Included Rated Output: 20 W; Power Supply: DC 12 V; Input: MIC.600 Ω x 1, TAPE10 kΩ x 1; Load Impedance: 4 - 16 Ω; Dimensions: Width 3.7 x Height 1.6 x Depth 4.7 inches (94 x 40 x 120 mm); Weight: Approx. 1.56 lbs (0 kg). Easy microphone broadcast. Convenient for work instructions and customer contact. It has a line-in terminal, so you can connect it to a preamp or bokebox to enjoy radio or tape broadcasting. Compact enough to be installed in small spaces. Dynamic microphone included. Please use a non-translant speaker for this amplifier.