Boost weak GSM signals effortlessly with the GREETWIN Economical Tri Band Cell Phone Amplifier. Engineered for 900/1800/2100 MHz frequencies, it enhances 2G, 3G, and 4G connectivity in low-coverage areas like basements or rural zones. Its compact, durable ABS housing ensures heat resistance and long-term stability. Precision-tuned circuitry minimizes interference while amplifying signals up to 100㎡. Plug-and-play setup requires no technical skills—ideal for homes, offices, or vehicles. Compatible with all major carriers globally. Ships with high-gain antennas for optimal performance. Wholesale pricing available for bulk orders.