2 pieces of Mp3 Player Module for Arduino, ESP32, ESP8266 | A 3.5mm aux output female connector for interfacing with speaker or headphone | Supported file formats: mp3 / wav | Power supply: 3.2-5.2VDC | Serial Interface with micro controller: baud rate is 9600bps | Micro SD Card Slot for holding micro SD Card
Relay supports Normally Open and Normally Closed | Relay supports High-level Trigger or Low-Level Trigger selectable by a jumper | Relay with Optocoupler Isolation | Relay with Terminal Blocks for both Input and Output Interface | Relay with two LED Indicators: power (green LED), the relay status (red LED)