1. Multi-Mode Playback: Supports Bluetooth, FM radio, USB drive, and TF card (Micro-SD).
2. Audio: GTS-1557 has 3" speakers (×2) with a 1200 mAh battery. GTS-1558 has 5W output (3" speakers ×2) with 800 mAh battery. GTS-1637 has 10W output (5W×2) with 800 mAh battery and includes a microphone and remote control.
3. Connection: TWS function supported (allows pairing two speakers together).
1. Multi-Mode Playback: Supports Bluetooth, FM radio, USB drive, and TF card (Micro-SD).
2. Audio: GTS-1557 has 3" speakers (×2) with a 1200 mAh battery. GTS-1558 has 5W output (3" speakers ×2) with 800 mAh battery. GTS-1637 has 10W output (5W×2) with 800 mAh battery and includes a microphone and remote control.
3. Connection: TWS function supported (allows pairing two speakers together).
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