Allows controlling up to 253 SC, series serial bus servos at the same time (adequate power supply required) . Wide range voltage input 6-12V (the input voltage and the servo voltage must be matched) Built-in WiFi and Bluetooth, as well as ESP-NOW support, for remote control and servo debugging Automatic download circuit for easy uploading programs Open source web application and various robot structures Compact size and space saving, suitable for integration into sorts of space-limited projects Color: As Shown 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.