It’s not a build but you do have to set it up some. All that’s required is that you buy some batteries cause it doesn’t include them.

Here’s the bust: Tamashii Nations Formania RX-78GP01-Fb Gundam Zephyranthes Full Burnern "Mobile Suit Gundam 0083" https://www.amazon.com/dp/B07BT4HKLH/ref=cm_sw_r_cp_api_i_6YkPEbTWQDB2H

batteries I bought: ENIYE LR44 AG13 357 303 SR44... https://www.amazon.com/dp/B07NVC4R4G?ref=ppx_pop_mob_ap_share

Hope this helps~