Features: Equipped with smooth and quiet TMC2209 driver, allowing for efficient working speed,ensuring accurate and quiet carving. Achieving impressive 240MHz main frequency for efficient performances and fast speed processing. Enabling control via mobile apps It also supports offline engraving for added convenience. Incorporates multiple safety mechanisms including engraving pause preventing, safety door function， These advanced safety for efficient desktop engraving machines. Ensuring a safe and reliabled carving experience while enhancing the overall performances and long service . Specifications: Size:about 22x14x7cm/8.66x5.51x2.76in Model：ESP32 V2.1 Engraver Control Board CPU Module: ESP32 Frequency: 240MHz Motor: TMC2209 PC: Support APP: Support Offline Carving: Support Emergency Stop Button Expansion: Support Shipped without storage card Package Includes: 1PC ESP32 V2.1 Engraver Control Board note: Please allow 0-1cm error due to manual measurement. please make sure do not mind before bid. Due to differences between different monitors, the picture may not reflect the actual color.