Works with any non-amplified/passive TV antenna. High gain is designed to amplify VHF and UHF SIGNALS with a LOW NOISE level, less than 2dB. Dual-color indicator, Green for long reception and Yellow for short reception. 3ft and 0.3ft EXTENSION COAXIAL CABLES are attached at either end for easy connection. AT-601B(Black) must be powered to function. Unit can be powered via the included USB cable by connecting to any USB power adapter supporting 5V output on USB-port.Engineered and designed in the USA by ANTOP, the antenna specialists, the ANTOP SMARTPASS AMPLIFIER features a SMART SWITCH to balance the amplification between short and long range signals received by the antenna. The Smart Switch is recommended to be switched ON to boost weaker signal level reception, and switched OFF to avoid amplification overload for stronger signal reception. The SMARTPASS AMPLIFIER is not recommended for use with an amplified antenna. Introduction The ANTOP Smartpass Amplifier, AT-601B,is designed to work with any non-amplified/pass antenna to boost the over-the-air TV signal received by the antenna. The attached 3ft and 0.3ft extension coaxial cables at either end offer connection flexibility and enable you to move the antenna within a wider placement range for better reception. The AT-601B supports over-the-air TV signals including HDTV, 1080P TV and 4K ULTRA HD.Smartpass Amplifier, exclusive ANTOP technology, balances reception range. 1) The inline Smartpass Amplifier's all-in-one design, allows you an easier connection and more possibilities in different receiving ranges. You don't have to hesitate any more on deciding between a short range and long range antenna! ANTOP's Smartpass Amplifier delivers the correct range for you.2) 4G LTE FILTER, blocks 3G and 4G signals from mobile phones, tablets, wireless networks or mobile phone transmitters to ensure a noise-free digital TV reception.