Nextivity Cel-Fi Duo+ - booster kit for cellular phone

The Cel-Fi DUO+ are designed to dramatically improve HD voice and data coverage in up to two bands for 3G/4G/LTE for consumers while significantly improving network coverage.

Good things do come in small packages: With 3G/4G/LTE support, Cel-Fi DUO+ are compatible with the highest data services application available.

All new patented echo cancellation algorithms enable Cel-Fi DUO+ to offer even higher signal levels throughout the coverage area than before.