The 255/257 from Teledyne Relays is a RF Relay with Frequency DC to 3 GHz, Coil Voltage 5 to 32 V, Voltage 5 to 26 V, Resistance 45 to 3800 Ohms, Operating Temperature -65 to 125 Degree C. Tags: Half-Size Crystal Can. More details for 255/257 can be seen below.