What's the difference between the GDP 107 and the GDP 104?

Design:

• GDP-107: Comes with a protective keyboard cover to shield the keys when not in use. Available in walnut color. The dimensions are 53.93" (L) × 13.38" (W) × 29.5" (H) with a furniture-style stand.

• GDP-104: Does not have a protective keyboard cover. Available in black, white, and walnut colors with a compact design. The dimensions are 47.6" (L) × 12.6" (W) × 27.9" (H).
  

Sound and Tone Features:

• GDP-107: Equipped with a custom European Dream sound source, with a maximum polyphony of 128. It includes 800 tones, 600 rhythms, and 80 demo songs. It supports 7 types of metronome and 88 drum sounds, as well as dual Bluetooth (audio and MIDI) and USB connectivity.

• GDP-104: Uses a high-quality DREAM sound source with a maximum polyphony of 64, featuring 128 tones, 128 rhythms, and 20 demo songs. Specifics on metronome and drum sounds are not detailed; supports audio and MIDI Bluetooth.

Additional Features:

• GDP-107: Offers recording/playback, MIDI arranger, chord accompaniment, and preset songs. It has a backlit LED display and two built-in 20W speakers.

• GDP-104: Similar functionality with recording/playback, MIDI arranger, etc., also with a backlit LED display but with two 10W speakers.