Outdoor play just got an upgrade KidiGo NexTag is WAY more than just tag it's a high-tech spin on 20 different backyard games including capture the flag, freeze tag and hide-and-seek. There's no internet needed to play all you need are the four included electronic units and adjustable arm bands , , A friendly voice explains the quick and easy-to-learn rules so kids can start playing fast. No referee required the game lets you know who's it and who won. There's one- and two-player games or the whole family can get in on the fun. Go from four to eight players by combining two KidiGo NexTag systems (sold separately). Play indoors or out with a 120-foot range between units. All you have to do is press the big button and tag, you're it Intended for ages 5+ years. Requires 8 AA batteries, 2 per unit. Batteries included only in red unit for demo purposes. New batteries recommended for regular use.