Junk Mail Hack
by Volthaus Electronics Laboratory in Circuits > Electronics
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Junk Mail Hack
![combo-box.jpg](/proxy/?url=https://content.instructables.com/FWC/23SG/I2LMEBJG/FWC23SGI2LMEBJG.jpg&filename=combo-box.jpg)
I received some junk mail the other day and it had a little plastic box sticky gummed to a large postcard-like piece of mail. Supposedly I could pull the plastic strip from the box and it would display my winning number to get a discount on buying a car. I don't own a car (by design) so I wasn't interested in the promotion. But the little plastic box I found to be very interesting. Before I did anything with it I found on the back the manufacturers name and a patent number. At their website they have a mockup that allows you to click on the tab for an animation of the action of activating the Combination Box. In the picture I have pulled the plastic strip. It just lays between the batteries and the cobar-connector. I had to use some pliers to pull it.
Open Device
![open-working.jpg](/proxy/?url=https://content.instructables.com/F67/43R0/I2LMEBNZ/F6743R0I2LMEBNZ.jpg&filename=open-working.jpg)
I ran a razor knife blade into the seam between the front and the back in the upper right hand corner and twisted. It popped the plastic post weld on that side and I repeated on the upper left side. You can see in the picture the two posts are all that hold it together. You can also see that the cobar-connector is held in place by those posts.
Disassemble
![dis-cobar.jpg](/proxy/?url=https://content.instructables.com/F0N/F4AE/I2LMEBLK/F0NF4AEI2LMEBLK.jpg&filename=dis-cobar.jpg)
![dis-bat-cobar.jpg](/proxy/?url=https://content.instructables.com/F75/9YP3/I2LMEBL7/F759YP3I2LMEBL7.jpg&filename=dis-bat-cobar.jpg)
![LED-In-situ.jpg](/proxy/?url=https://content.instructables.com/F9N/EDAY/I2LMEBNU/F9NEDAYI2LMEBNU.jpg&filename=LED-In-situ.jpg)
![LED.jpg](/proxy/?url=https://content.instructables.com/FTF/VOD4/I2LMEBNC/FTFVOD4I2LMEBNC.jpg&filename=LED.jpg)
![LED-CU.jpg](/proxy/?url=https://content.instructables.com/F3H/DKPN/I2LMEBNN/F3HDKPNI2LMEBNN.jpg&filename=LED-CU.jpg)
![guts.jpg](/proxy/?url=https://content.instructables.com/FKD/GOA9/I2LMEBMZ/FKDGOA9I2LMEBMZ.jpg&filename=guts.jpg)
![L1131_battery.jpg](/proxy/?url=https://content.instructables.com/FLE/VW2X/I2P3OPF5/FLEVW2XI2P3OPF5.jpg&filename=L1131_battery.jpg)
This metal connector just lifts out. In fact once the halves are separated nothing is glued in place. Now you have two free alkaline batteries: Specifications: Model Number L1131 Voltage: 1.5 Chemistry: Alkaline Capacity: 80 mAh Brand : AGW Size: Button Cell Height : 3.05mm (0.12") Diameter : 11.6mm (0.46") Weight: 0.0938 lbs.
You also have a neat little LED with the long lead being the positive lead. Unfortunately the 5 digit readout is fake. It's neat how the LED fits into the little plastic box though.
So now enjoy your free stuff!