Type of RF Attenuators as follows : Surface Mount Type Tab & Cover Type Flange Type Coaxial Type Key Specifications/Special Features: (1) Impedance: 50 Ohms (2)Power Rating: 2W - 250 W (3)Frequency Range: DC-4GHz (4)Attenuation Value: 1-30dB (5)Attenuation Tolerance: 1-10dB ±0.6dB 11-20dB ±0.8dB 21-30dB ±1.0dB (6)Operating Temperature: -55%u2103 to %uFF0B150%u2103 (7)Temperature Coefficient : ±150ppm/%u2103 (8)Substrate Material: BeO, AlN,Al2O3 (9)RoHS Compliant For more information, pls you visis our website: www.ketemicro.com