Gravity 3-Pin interface, color-coded, plug-and-play, supports hundreds of electronic components in the Gravity series Supports 3 3.3V analog inputs and 3 3.3V/5V digital inputs and outputs, 3.3V and 5V drive voltages can be switched at will Powered by an external USB interface, it can drive high current servos, lights and other components Onboard 3.5mm headphone plug Perfect silk screen and power indicator Anti-reverse pad on the back Use a pin instead of finger slot for low and stable installation Shen craft, overall quality : is a miniature multi-function IO sensor expansion board designed for :bit. 3Pin interface supports 's hundreds of Gravity series of electronic components, eliminating the cumbersome alligator clip insertion steps for :bit users. : is small in size and has the same shape as :bit. It only adds 5mm thickness after installation, which fully integrates the common functions of :bit. The expansion board is connected to it by a metal , which leads to a of 6 sets of Gravity interfaces and a 3.5mm headphone jacks. In addition, the expansion board is equipped with a 3V-5V voltage switching function, which can drive up to 5V 2A electronic components (requires external -USB power supply support) to that the servos, small motors and other equipment can operate normally. Gravity IO extensions 3 analog ports (only supports 3.3V analog input) 3 digital ports (support 5V/3.3V digital input and output) Servo drive current: 1.2A Input voltage: 3.3V/5V Colour:black Material:plastic Package Contents: 1 x expansion board 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.