This is a solution to solve poor cell phone signal. If you have a good signal outdoor but poor signal indoors, then this is exactly what you need. 

This product contains a cell phone signal repeater, two antennas and coaxial cable. 

The working principle is that the antenna receives signal from the base station and transmits it to the repeater, which will boost the received signal several times and then transmit it to the other antenna, and the antenna will broadcasts a good signal in the room. 

No more dropped calls and enjoy blazing faster data by one-time purchase. Suitable for apartment, basement, office, garage, etc.

Features:

• 4G Network Frequencies: This signal booster is designed specifically to work with the Band 5 frequency range of 850MHz, commonly used for 4G LTE networks. It is tailored to enhance the signal quality and coverage in this particular frequency band.
• Improves Mobile Signal Strength and Coverage: If your home or office is with weak or low 4G signal, this booster can significantly amplify the signal, providing you with a stronger and more reliable connection. This is especially useful in areas where there are good signal outside but weak signal inside
• Boosts 4G LTE Signals for Faster Data Speeds : By amplifying the 4G LTE signals, this booster enables faster data transfer rates, leading to quicker web browsing, smooth video streaming, and improved app performance. 
• Low Loss Cable Ensures Minimal Signal Attenuation and Maximum Efficiency: The signal booster kit includes a low loss cable, which helps minimize signal loss during transmission, ensuring that the boosted signal reaches your device with maximum efficiency, resulting in improved performance.
• Easy Installation Process, No Technical Expertise Required: The booster kit comes with clear and user-friendly installation instructions, making it easy for anyone to set up. No technical expertise or special tools are necessary for installation. Compact and Durable Design for Long-Lasting Performance: The signal booster is designed to be compact, so it won't take up much space, and its durable construction ensures long-lasting performance in various environmental conditions.
• Compatible with Major Carriers and Devices: This booster is compatible with popular carriers that use Band 5 (850MHz) frequencies. It supports a wide range of devices, including smartphones, tablets, and mobile hotspots that can connect to 4G LTE networks.
• Enhances Indoor  Signal Reception for Homes, Offices, and Vehicles: Whether you need better signal reception in your home, office, or vehicle, this booster kit can enhance indoor coverage, providing you with better connectivity. 

Working Principle

1. Outdoor Antenna: The process begins with the outdoor antenna, which is mounted outside the building or vehicle where the signal is typically stronger. The outdoor antenna captures the strong incoming mobile signal from nearby cell towers. It acts as a receiver, collecting the existing signals that may be hindered by obstacles like distance, terrain, or building materials.
2. Repeater: The captured signal is then sent to the repeater. The repeater is responsible for boosting the received signal's strength. It increases the power level of the signal without distorting it. The repeater's gain, measured in decibels (dB), determines how much the signal is amplified.
3. Indoor Antenna: After amplification, the enhanced signal is transmitted to the indoor antenna. The indoor antenna is placed inside the building or vehicle where the signal is required to be improved. The indoor antenna broadcasts the boosted signal across the designated area, effectively extending the mobile coverage.