Boosts low-power digital cell phones up to 500%. Increases coverage up to 50 miles or more. Improves call reception. Reduces dropped calls and signal fades. Extends the life of your cell phone battery by using less battery power. Enchanced data connections for better Internet, fax and text messaging. Easy connection to phone and installation for boat, vehicle, RV, home or office. Made to use with cellular systems: CDMA, TDMA, PCS, GSM 850 and GSM 1900. Compatible with dual band and tri-mode phones. Use Digital Antenna adapter cable to connect cell phone to amplifier (sold separately).