Teledyne Relays offer this genuine first ever hermetically sealed LoopBack relay. Each LoopBack relay combines two DPDT electromechanical relays in one package that includes an internal bypass path for automated test equipment applications. Combines the technology of two Teledyne RF300 Series relays- which eliminates the need for external PCB traces in loop-back test applications, this innovative thinking results in a superior signal integrity and RF performance, while at the same time takes up minimal board space. For digital signaling applications, this provides an excellent signal integrity up to 12 Gbps data rates.