You can get ones that track you. I was thinking for airsoft but thought it might be too much of a giveaway xD
So I've been reading the Pokemon manga over the last few days. I occasionally pick up a new volume and re-read them all. I'd originally read a few issues as a kid and picked the actual volumes over the last year. Went to Forbidden Planet and got another 3 last week. I'd forgotten how much I enjoyed it.