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1. It can control up to 253 SC and ST series bus servos at the same time (provided that the power supply is sufficient)2. Wide voltage input 6-12V (input voltage needs to match the servo voltage)3. Built-in WIFI and Bluetooth, support ESP-NOW at the same time, can remotely control and debug the servo4. The automatic download circuit is convenient for uploading the program5. Open source web applications and various robot structures. Mini and compact, save space, suitable for embedding in various projects with high space requirementsProduct Name: ESP3 Servo Expansion BoardSupply voltage: DC 6-12VPower supply interface: 5.5 x 2.1mm DCDownload interface: type-cMain control chip: ESP32Control mode: UARTVia diameter: 2.75mmPositioning hole spacing: 23 x 58mmProduct size: 65 x 30mmcolor:BlackMaterial:PCBPackage Contents:1 x servo expansion board1 x screw packOnly the above package content, other products are not included.Note: Light shooting 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.