Wireless 2.4G Microphone Amplifier Portable Microphone 1. Battery capacity: 250mAh 2. Signal-to-noise ratio: 95dB+ 3. Frequency response range: 20Hz–20KHz 4. Charging input: DC 5V 5. Usage time: up to 20h 6. Accessories: includes dual-ended charging cable, 6.35mm jack 7. Weight: receiver about 28.2g, lapel clip about 35.3g, headwear about 42.5g 8. Size: transmitter about 6.8 x 3.5cm, receiver about 8.5 x 3.5cm Features: 1. Four comfortable wearing options: headset, lapel clip, handheld, or neck-worn 2. Widely compatible with devices like portable PA systems, interactive teaching systems, computers, audio equipment, and mixing consoles 3. 2.4GHz reception and transmission with 15 optimized anti-interference frequency bands 4. 16-level gain adjustment for seamless adaptation to diverse environments 5. Ultra-lightweight and compact design for effortless portability 6. DSP noise-reduction chip with active noise-canceling algorithms to eliminate background interference 7. Cardioid pickup pattern captures every subtle vocal detail without requiring loud projection 8. Exceptional recording fidelity that vividly reproduces the richness of live audio