2 PCS Electronic Accessories: 1 x Expansion board & 1 x 20A PWM DC Motor Speed Controller 12V 24V 36V 48V /w Potentiometer Knob Switch ca Compatible With: BBC Micor:Bi Accessory Type: Extension Board 5V 1A power supply for greater driving force 3.3V and 5V power interface Input voltage: DC10-60V Output voltage type: Load Linear Output Current: 20A Continuous power: 1200W Speed Type: adjusting flow Speed mode: potentiometer (linear) Speed range: 0 - 100% Control frequency: 25KHZ Connection Type: Barrier Terminal Block 3.5mm audio connector 5 gold fingers Builtin buzzer (switch switching) Yellow and black differentiated 3PIN interface 5V 1A selfrecovery fuse colour:black+green Material:ABS+PC+ metal size: Expansion board: 56 x 44 x 12mm Module size: (L x W x H) 77MM x 45MM x 28MM Board Mounting size: (L x W) 73MM x 40MM Potentiometer installed opening hole size: 7MM Knobs Cord length: 20CM Package Contents: 1 x Expansion board 1 x 20A PWM DC Motor Speed Controller 12V 24V 36V 48V /w Potentiometer Knob Switch ca Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.