Product: USB to TTL Serial Adapter (Mini USB) Key benefits Converts any computer Mini USB port into a TTL serial interface for direct communication with TTL-level devices. Built-in TX/RX communication indicator LEDs show serial activity in real time, making debugging and data transfer visible and reliable. Selectable logic levels (3.3V and 5.5V) increase compatibility with a wide range of TTL devices and reduce the need for additional level-shifting hardware. Extremely compact Mini USB form factor for easy integration into workbenches, test rigs, and confined enclosures. What it does Acts as a USB-to-TTL transceiver and serial adapter, allowing a PC to send and receive TTL serial data over a Mini USB connection. Provides clear visual feedback with transmit and receive indicator LEDs to confirm activity and troubleshoot connections. Important specifications Function: USB to TTL serial converter / adapter module Voltage support: 3.3V and 5.5V TTL logic levels Interface: Mini USB Indicators: TX and RX communication LEDs Module size (listed): 4.30 x 1.75 x 1.20 cm Adapter module size (alternate listing): 36 x 17.5 mm Why customers need it Simplifies development and testing by eliminating the need for separate USB-to-serial dongles or complex wiring. Reduces development time with visible communication status and straightforward Mini USB connection. Compact size makes it easy to carry, store, and install in tight spaces where full-size adapters won’t fit. Practical use scenarios Serial debugging: Monitor debug output from microcontroller projects and verify data transmission with the TX/RX LEDs. Firmware flashing and configuration: Upload firmware or configure TTL-level modules directly from a laptop via Mini USB. Data logging and device control: Connect sensors, modules, or other TTL-level peripherals to a computer for logging, control, or diagnostics. What to expect in day-to-day use Plug-and-play Mini USB connection to your computer, then connect the adapter’s TTL pins to your device set to the matching voltage (3.3V or 5.5V). Immediate visual confirmation of data flow through the TX/RX LEDs, making it easy to verify wiring and communication. Small footprint and straightforward operation suited for bench work, field service, or permanent installation where size matters. Compatibility note Intended for use with TTL-level serial devices and systems that accept 3.3V or 5.5V logic. Interface is Mini USB as specified.