Features: CP2102 module:High performances USB to TTL chip for stable serial communication. USB to Serial Function:Convenient serial communication between computer and other devices. Highly-speed transmission: supports fast data transmission up to 115200 , providing stable communication effect. Strong compatibility: widely for variety of devices. Small and portable:Compact design, easy to carry and install, convenient to use in different occasion. Specifications: Item: USB To TTL/Serial Module Serial Converters Size:About 1.6×2cm/0.63x0.79in Quantity：2PCS/4PCS Control：CP2102 Chip USB: MicroUSB Package Includes: 1Set USB To TTL/Serial Module Serial Converters note: Due to the problemof lighting effects and shooting, there might be tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.