Check the listing for details. [ Flyron FN-AL7T-N ] Triggerable MP3 Audio Player - Negative Trigger. Condition: New. Listed at 54.95 USD. Two trigger versions (negative trigger and positive trigger) optional. Built-in a high quality MP3 player with 8MB flash memory. Supports inserting USB flash drive and micro SD card as the extended storage devices. Supports max. 32GB USB flash drive and max. 32GB micro SD card. 7 trigger inputs available and they can be connected with as many as 7 buttons/switches/relays, etc.Supports RS485 control mode to meet some industrial applications. Built-in a class D 10 Watts amplifier and the sound is loud and clear. Upload audio files by connecting the micro USB port of the device to computer with a USB data cable. Sound volume is adjustable through turning the potentiometer. Able to drive an external equipment like a warning light or a motor simultaneously when it is playing a sound. Equipped with a 3.5mm audio output jack that can be connected to an external amplifier or an active speaker. Technical Parameters:Working voltage: 12-40V DCWorking current: ≤1000mAPower Consumption: ≤10WFlash memory size: 8MBAudio format: MP3 (≤192Kbps)