1), Permanent chip 2), this is only 1 set chip (4 color :bk c m y ) 3), ciss chip , cartridge chip 4) cartridgemodel : for hp 711 CHIP 3) printer model : forHPDesignjet T120 forHP Designjet T520 printer 1.This kind of chip can not indicate ink level. You can install this chip on Refillable ink cartridge or CIS system. 2.Attention: For refillable ink cartridge users: Please make sure the ink cartrdge always have ink in it, that means users have to add ink before ink cartridge out of ink. So we suggest users check ink level one or two times every half an month according to your printing job quantities. 3.The chip\'s life will be over if ink cartridge out of ink.