YANMAI K5 Teaching Training 2.4G Wireless Bluetooth Voice Amplifier Lapel Microphone 1. AI Noise Reduction: Built-in DSP anti-whistle chip with AI noise reduction function that specifically picks up human voices while filtering out background interference, ensuring crystal-clear audio transmission. 2. Advanced Bluetooth 5.3: Features Bluetooth 5.3 technology for wide compatibility and seamless pairing with smartphones, tablets, and computers, making it versatile for various devices. 3. High-Power 20W Output: Up to 20W speaker delivering high-quality sound with loud volume, ensuring everyone can hear clearly even in large spaces like classrooms and outdoor venues. 4. Long-Lasting Battery: Features 2500mAh lithium battery in the amplifier and 300mAh in the microphone, providing over 15 hours of continuous use for the amplifier and 10 hours for the microphone. 5. Fast Type-C Charging: Uses mainstream Type-C fast charging for both devices - amplifier charges in about 3 hours, microphone in 1.5 hours, ensuring quick and convenient power replenishment. 6. Versatile Applications: Perfect for tour guides, teachers, sales personnel, outdoor entertainment, morning exercises, speeches, fitness instruction, dance classes, and presentations. Specifications: Receiver: 1. Charging Current: DC5V-900mA 2. Charging Time: Approx. 3 hours 3. Bluetooth Version: V5.3 4. Maximum Power: 20W 5. Usage Time: Over 15 hours 6. Battery Capacity: 2500mAh 7. Transmission Method: 2.4G 8. Frequency Response: 100Hz-13kHz Transmitter: 1. Charging Current: DC5V-200mA 2. Charging Time: Approx. 1.5 hours 3. Signal-to-Noise Ratio: Greater than or equal to 85dB 4. Directional Vision: Unidirectional 5. Usage Time: Approx. 10 hours 6. Battery Capacity: 300mAh 7. Sensitivity: -50+-3dB 8. Receiver Distance: Greater than or equal to 20 meters