A 10/15/20dB cavity coupler for 698~2700MHz, N Female, is suitable for being installed with any kind of mobile phone signal boosters, including repeaters intended for GSM, 4G LTE and 3g cellular networks. The accessory has a coupling value of up to 20 dB. It will help to minimize the risks of losing the signal power while the signal is being sent from one antenna to another within a series of antennas. The Ingress Protection Code is IP55.