This is a cheap chinese rip-off piece of equipment. The charger itself weighs about 1/4 of what the OEM charger weighs, indicating there's not much in the way of substance/electronics inside. Also, the plug doesn't stay in the Sidekick jack if you fart in it's general direction. And finally, if you do manage to get it to stay connected it takes about 6x longer to charge the phone with this compared to the Sharp OEM charger (I bought one on eBay after I threw this in the trash).