The woofer is from an old 2.1 Philips PC desktop speaker. The speaker cone was replaced recently. The FM antenna is just a wire.
The mid & tweeter speakers on the rear are new. They are full-range speakers, not really mid-range tweeter speakers. Also, on the rear is a 2.1 mm DC plug socket.
The wood enclosure is cheap plywood on the front & back. Other four sides are MT boards.
The MP3 panel (Rs. 300) is the best part. It works splendidly – MP3 (USB disc & MicroSD card), radio and line in.
LM386-based circuit provides 20x amplification. A 3-way crossoverall board splits the audio to the speakers.
As operating voltage is 5 to 35v, anything from a PC USB or a mobile power bank or common mains power adapters can run the device.
Sound output is excellent with powerline noise eliminated with a 1000uf capacitor on the LM386 circuit.