Check the listing for details. [ Flyron FN-AP02-LDR ] Light Sensor Activated Sound Player Module. Condition: New. Listed at 15.95 USD. Features:Adopts a high quality MP3 decoder chip on the board.Works with most Windows, Mac, and Linux systemsBuilt-in a 4MB flash memory that can store max. 4 minutes long MP3 file based on 128Kbps.Update MP3 audio file through the micro USB port on computer.Supports to store one MP3 audio file only in the flash memory. On-board 1watt amplifier that is able to directly drive a 1W 8ohm speaker.3.7V to 5V DC power input.Supports 3.7V/4.2V rechargeable lithium battery to be the power supply.Built-in the recharging circuits on the board, and lithium battery can be recharged through the micro USB port. The length of all of the lead wires is 100mm by default. Stable performance and beautiful sound output. PCB size: 32mmx22mmDiameter of Speaker: 40mm Technical Perimeters:Working voltage: 3.7V to 5V DCWorking current: ≤100mA (Input: 4.5V DC)Quiescent Current: 350uAPower Consumption: ≤100mAFlash memory size: 4MBytes(32Mbits)Audio format: MP3