Sensing of spectrum holes constitute the fundamental step to utilize spectral resources efficiently in Cognitive Radio (CR). This new technology trends intends to alleviate the scarce and underutilized spectrum issues occurred in traditional fixed spectrum allotment. CR defined as dynamic spectrum usage of unlicensed (secondary) user in opportunistic manner without causing harmful interference to licensed (primary) user. Much recent works presented as either theoretical or simulation approach. However, this paper presents a design prototype of indirect and non-parametric of spectrum sensing method implemented using low-cost Universal Software-defined radio Platform (USRP™). A spectrum-sensing algorithm designed based on energy detection built on top of Matlab®/Simulink® interfaced with a USRP™ main board and SBX transceiver daughterboard; both are Ettus Research product.