Mine had a dead battery on arrival. Fortunately, I had read the other reviews and noted this as a possibility, so tried swapping the battery before giving up when it didn't work at first. There's no user manual and the link to Wahoo's web site doesn't work any longer - the company told me that they had stopped manufacturing these and were just selling what stock they had left (why that means no user manual any longer I don't know). If I were to be buying again I would go for one of the many other ANT+ foot pods.
truly accurate and connecting with any ANT+ device easily. The only downside was that the battery was already dead when I received it, which means that the sellers didm't have the care to make sure it was charged. other than that great device has I told.