The clickmate is an AWESOME little device. The clickmate cartridges last FOREVER, and they come 2 to a pack. I've ordered several of the clickmate devices, so I always have a charged one, but the battery also really holds up. It lasts a decent amount of time. I was surprised how long with the first one. All in all, I'm a HUGE fan of the clickmate device, and highly recommend it. 👍👍👍👍👍