TH-420 II Box Is R&D By Kangvape Technology, It Has Special Design,can Adjustable Working Voltage 3.4v-3.7v-4.0v, Also Different Light Display Current Battery Power.Beautiful Surface,very Small And Convenient.The Atomizer Is Smartly Inserted And Locked In The Box By A Magnetic Connector ,it Can Use All 510 Hemp Cbd Coil Atomizer.