Do you have to plug in this blanket to use it?

a href="http://www.amazon.com/gp/product/B001VDTZXS/ref=s9_simh_gw_p79_d0_i1?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-7&pf_rd_r=1K5005T1X5MDTRZQKPTV&pf_rd_t=101&pf_rd_p=470938451&pf_rd_i=507846" rel="nofollow"http://www.amazon.com/gp/product/B001VDT…/a