-Auto turn-off protection in case of excessive self oscillation or over input. -ALC function,auto control of output power for stable coverage. -CB65G mobile network signal repeater easy to cover over home 100-500m2 and easy to install. -Able to increase signal coverage,decrease mobile phone radiation, and increase mobile phone battery lifespan. -Average using life is over 5 years. -One year warranty. Send us inquiry to get code for checking the specifications.