NooElec NESDR Smart - Premium RTL-SDR w/Aluminum Enclosure, 0.5PPM TCXO, SMA Input. RTL2832U & R820T2-Based Software Defined Radio Premium Software Defined Radio 'NESDR SMArt' in a beautiful brushed aluminum enclosure. Proudly built by NooElec in the USA and Canada! Full 2-year product warranty A wide variety of improvements on other designs, including ultra-low phase noise 0.5PPM TCXO, RF-suitable voltage regulator, custom heatsink, 2 silicone pads and SMA female connector Designed from the ground up to reduce USB port occlusion. Run multiple NESDR SMArt side-by-side with any USB-compliant device, including tightly-spaced embedded devices like the Raspberry Pi SDR frequency capability approximately 25MHz-1700MHz. Frequency range can be extended down to 100kHz or lower with the Ham It Up, also available on Amazon (B009LQT3G6) An 8pc SMA adapter set and carrying case is also available on Amazon (Product ID B073JT98RR)