a small hole approximately u215b inch diameter through the panel alternatively the back of the housing 14 can simply have a nipple that extends into the hole 58 or a hooked nipple generally l shaped which is extended such that the leg of the l shape goes through the hole to the back of the panel then the housing is pivoted down against the panel until the cam lock cylinder unit 26 passes through the cam lock hole in the cabinet or panel an important feature of the invention is that the keypad operated electronic cam lock device 10 includes no housing or electronic components at the inside of a door or drawer or panel the only structure of the lock device extending into the interior or back side of the panel on which attached is the cam lock cylinder unit 26 and optionally a threaded fastener or machine bolt 56 this makes the unit of the invention compatible with situations in which nearly all cam locks are used since those simple prior art key operated devices typically comprise a rotatable plug for receiving the mechanical key a cam lock cylinder with a front face plate and a tail on the plug which has the cam affixed to the.