<ul><li>Brand: Echelon</li><li>Bluetooth Version: 5.3 for stable and efficient wireless connection</li><li>Transmission Distance: Up to 10 meters</li><li>Battery Capacity: 400mAh, offering 7-10 hours of playback time</li><li>Standby Time: Approximately 120 hours</li><li>Charging Time: Around 2 hours</li><li>Frequency Response: 20Hz to 20kHz for full-range sound</li><li>Sensitivity: 105±3dB for clear audio</li><li>Speaker Diameter: 40mm for enhanced sound quality</li><li>Built-in Microphone: Yes, for hands-free calls</li><li>Usage Modes: Bluetooth and TF card MP3 mode (supports up to 32GB)</li><li>Audio Controls: Volume adjustment, song switching, and call management (answer/end calls)</li><li>Charging Voltage: 5V-1A</li><li>Audio I/O Interface: Supports external connections for more flexibility</li></ul>