Features: 1. Large area coverage 100-200 square meters (-75dBm, transparent indoor environment, depending on the distance of surrounding base stations) 2.30W (single channel 3-5W) effectively shields triple-network 2G-3G-4G-5G mobile phone signals and WIFI signals 3. Equipped with a precision voltage stabilizing circuit, it can be used normally even under large voltage fluctuations. 4. Original chips and circuit boards ensure high efficiency, stable performance and long service life. 5. Durable ABS shell: waterproof, wear-resistant, heat-resistant 6. Convection vents and integrated high-efficiency radiators and fans avoid local heat accumulation and efficiently dissipate heat. 7. Simple appearance, small size, does not take up space 8. Green and environmentally friendly, no harm to the human body 9. Simple and convenient installation