1, The item for 70V / 100V constant voltage audio power amplifier, maximum input 300 Watts(per channel), can support 8 pairs of speakers. 2, Parallel connecting block for use with Impedance matching volume controls. One Stereo Input, eight stereo outputs. Detachable connectors for easy wiring. (NOTE: Must be used with impedance matching volume controls) 3, INPUT terminal block: Pitch 7.62mm/0.3", Wire range 26AWG ~ 10AWG / 4mm square. Strip length 8mm. Screws - M3,steel, Cr3+ Zn plated. Pin header and Cage - Brass. 4, OUTPUT ZONE 1 to 8 Terminal blocks: Pluggable screw terminal blocks, Pitch 7.62mm/0.3", Wire range 28AWG ~ 12AWG / 2.5mm square. Strip length 7mm. Screws - M3,steel, Cr3+ Zn plated. Pin header and Cage - Brass. 5, High quality fireproof nylon material mount carrier, also included are two M3 x 10mm wood screws, you can easily mount it on a wooden board.