Cell Phone Booster, Boost 4G/5G Signal up to 4500Sq ft, Support band 5/12/13/17, FCC Approved

FCC Certified: :Cell booster complies with all FCC guidelines and meet the requirements of application standards,does not interrupt or compromise any carrier's signal to and from the cell tower. Tips! Check if your cell phone is compatible with the product band before purchasing. Check the band Method: For Android phone: Download 'Network Cell Info Lite' or 'LTE discovery' → check 'Band' number For iPhone: 1. Dial *3001#12345#* and press call button→2.Check “Band Info” The band numbers will change when the signal is unstable, we recommend that you test a few more times outdoors where the signal is better to see what the last consistently appearing band numbers are. Tip! This product only amplifies weak cell phone signals, not WIFI signals. Easy app-guided installation using the service app to locate the nearest cell tower for precise antenna alignment Flat window cable allows for drill-free setup ALC technology automatically adjusts the signal strength to ensure optimal performance and prevent interruptions High-gain directional Yagi antenna improves signal reception from a distance FCC-approved with a 30-day money-back guarantee, 3-month replacement, and up to a 3-year warranty. FCC ID: 2ALZECL70VA-01 Still confused about this product and don't know how to choose? Consult our customer service, we will answer your questions within 24 hours.