This works with the DTv4, I’ve been wanting to grab it for a bit now but I’ve seen it on here. Amazon Tortoise Bubbler
Check this out. A couple people on r/waxpen have picked this up. The tortoise! https://www.amazon.com/dp/B07QML1F7B/ref=cm_sw_r_cp_apa_i_uj26Eb34NYVBX
Found it..it's Tortoise!