Description: Signal Boosters This GSM signal am plifier case is made of alloy which is hard,so the inner parts won't easily break under this case's for protection. This GSM has small size and is lightweight which can be mounted on the wall without easily falling off by its own weight. This mobile comes with a manual which can let you learn about the installation of the am plifier. This phone signal am plifier is powered by 110-240V input voltage and is a great choice to be used on travel or business trip. This circuit board is crafted under strictly condition which can provide you a stable signal. Specification: Material: Alloy. Size: 22cm*12cm*3.5cm. Frequency range: upstream 890-915MHz downlink 935-960MHz Power: 27DBm, gain: >65DB, coverage: 50-200 square meters Power: -70~-40dBm Gain: Up 50dB, down 65dB Maximum output power: up 23dBm down 27dBm, Power Supply: DC 5V / 1A (AC110-240V) Impedance: 50Ω Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package Includes: 1* Indoor antenna. 1* Outdoor antenna. 1* Signal am plifier. 1* Adaptor. 1* Manual.