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Note: If there is no outside signal, the booster will not work for you. Does Phonetone booster work for your location? A cell phone could use different frequency band at different locations, it is very important to confirm if your cell phone works on same frequency band as the cell phone booster. To check which band your cell phone uses: For iPhone Dial *3001#12345#*, then press Call button Click 'Serving Cell Info' Check 'Freq Band Indicator'; For Android phone Download and install the app: LTE Discovery Tap 'SIGNALS' and check band number Specification: Frequency Range: Band 12/17 and Band 13 Max Output Power: 20dBm Max Gain: 65dB I/O Port: N-Female on both ends Main Power: AC 100~240V / DC 5V Package: 1 * Booster 1 * Power Adapter 1 * Mounting Screw Kit 1 * English User Manual 1 * Indoor Antenna with 1.5m Cable 1 * Outdoor Antenna with 15m Cable Warning: This is a Consumer device. Before use, you must register this device with your wireless provider and have your provider's consent. Most wireless providers consent to the use of signal boosters. Some providers may not consent to the use of this device on their network. if you are unsure, contact your provider. You must operate this device with approved antennas and cables as specified by the manufacturer. Antenna must be intalled at least 20cm (8 inches) from any person. You must cease operating this device immediately if requested by the FCC or a licensed wireless service provider. E911 location information may not be provided or maybe inaccurate for calls served by using this device.