Compatible With: BBC Micor:BiAccessory Type: Extension Board5V 1A power supply for greater driving force3.3V and 5V power interfaceSupport 3V5V sensor module:bit all pins lead3.5mm audio connector5 gold fingersBuiltin buzzer (switch switching)With mounting holesYellow and black differentiated 3PIN interface5V 1A selfrecovery fusecolour:blackMaterial:ABSsize: 57 x 37 x 12mmPackage Contents:3 x Expansion boardNote1. When using :bit power supply, IO port current is less than 200ma, please do not connect high current devices (such as large , DC motor), otherwise it will burn out :bit.2. When using a 5V external power supply, you can drive multiple small servos, but please note that the current should not exceed 1A.3. If you use the high-low read function of the pin, you must set the pull-down on the pin.4. If P0 is used as a normal IO port, the buzzer toggle switch must be placed on the off side, otherwise the buzzer will sound or the IO read value will be abnormal.5. Use the shared pin with the :bit dot matrix (such as 3, 4, 5, 6, 7, 8, 9, 10, 11), remember to disable the dot matrix screen on the software.6. Do not use IO19,20.19and 20 can not be used as an IO port, only for I2C communication.7. The USB port allows a maximum input current of 1A.8. Do not use on metal products to avoid short circuits.Only the above package content, other products are not included.Note: Light 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.