A transdermal delivery device drugs (100, 100 ') comprising a cartridge (104), the cartridge (104) a first reservoir (110) for containing a medicament (102), and an array of microneedles (116) comprising being at least one of the microneedles (116) in fluid communication with the first reservoir (110), a lid (106) attachable to the cartridge (104) for covering the first reservoir (110), a power supply (114 , 144), an electronic device (138) provided on the cover (106) configured to receive electrical energy generated in the power supply (114, 144), and a logic device (136, 214) configured to selectively control the distribution of electrical power to the electronic device power (138), wherein the distribution of the electrical energy causes the electronic device (138) administering the drug (102) contained in the first reservoir (110), wherein the AC is not plugged ion (144) comprises an electrolyte material (114) in a second reservoir (112) formed in the cartridge (104) and electrodes (146, 148) located so that the power supply (144) is activated when the lid ( 106) is placed on the cartridge (104).
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