5Pcs USB-TTL UART Serial Adapter CP2102 5V 3.3V USB-A RobotDyn for Arduino - products that work with official Arduino boards

The high-performance, optimal cost CP2102 USB to UART bridge family offers a complete plug and play interface solution. 
Crystal-less operation, in-system programming memory and small body size packages reduce cost, simplify design and shorten development time.
Speed: USB 2.0 (12 Mbps) / Up to 1024 Bytes / up to 2 Mbps / USB-A 
Tolerance: 3.3V/5V
Working temperature: -40 to +85 °C 
Size: 15.5 x 23mm
The CP210x USB to UART Bridge Virtual COM Port (VCP) drivers are required for device operation as a Virtual COM Port to facilitate host communication with CP210x products. 
These devices can also interface to a host using the direct access driver.
The Serial Communications Guide for the CP210x, download an example above.
Package includes:
5 x USB-TTL UART Serial Adapter