Not even with the battery. Totalmente recomendables! I just received this keyboard and the best part for me is the key feel. Upon opening, it fell apart. Though I could move up to 2666Mhz. Since I have a generous budget (the Sonys lasted me 3 years), I am still shopping. I have high arches and are prone to problems if support is not good--these are very good, plus comfy. First, it took me over an hour and not exactly easy, so my experience is different than those who say easy and 20 minutes. I love that this hanging bar is adjustable width wise as well as for length. Guess what? The instructions that come with these dont allow for pairing with both a cell phone and a transmitter.