Check the listing for details. Fitbit One Wireless Activity Tracker (Pick & Choose) v6.60. Condition: New other (see details). Listed at 103.96 USD. Fitbit One tested/inspected new battery like-new condition with little to no wear Firmware locked6.60Works just fine on this firmwareYou are welcome to try to update but you don't need to Free Return/Replace~Product Support Specializing in fitbit ones on ebay since 2017Family owned and operatedHigh quality refurbishing done on site Buyer beware :There are no more new-in-box fitbit ones that actually work. They are either defective or they have been secretly refurbished and repackaged as new. Batteries go bad or the firmware is so old that it does not connect/sync...or both. Sellers claiming to have "USA manufactured batteries" are full of it. Tiny batteries likethe one in the fitbits are almost exclusively made in China. I've tried batteries from several suppliers over the years in an effort to find the best. The batteries I currently use are fresh and of high quality, however, I'm always on the hunt for better.Expect 7-14 days on a charge, depending on use. Quantity updated as devices become available Some feedback we have received specific to the fitbit one: "Extremely pleased with this purchase. Works just like a new one!" "Fitbit looks perfect - current firmware load, looks pristine. Powers up and tracks steps correctly. Can't do any better!" "Item is like new!" "Wow! It looks like new! Can't wait for Christmas to give it to my wife whose Fitbit One bit the dust." "This is my second Fitbit One purchase from this seller. He's honest, highly competent and speedy in sending out his items. It's definitely worth paying a little more to buy from him. Most highly recommended!!! My husband, like me, is a fan of the One and lost his. Thankfully Ben came to the rescue😎." "Super helpful, super quick shipping, great experience!" "Absolutely perfect! It’s in great condition. Fast shipping. Thanks!!" "My item arrived quickly, it was nicely-packaged, and the item itself was in great condition. Would definitely order from this seller again!" "My Fitbit arrived on time and has worked beautifully." "I liked dealing with this seller." "Excellent transaction. This guy stands behind what he sells." If you already have the fitbit one and it simply needs a battery, check out my BATTERY REPLACEMENT SERVICE listing.https://www.ebay.com/itm/256207562831or type copy/paste this item # 256207562831 in the ebay search bar Be well, stay young!