This Sanwa M17 transmitter comes with an RX491 receiver, making it a great choice for those interested in RC model vehicles. With a frequency band of 2.4GHz, it is compatible with scales of 1:12, 1:8, and 1:10. Includes 2 Protek 3000mAh TX battery packs. TX and RX work great....the RX case is in a little rough shape so a new one might be in order. These items are sold as is. Free Fedex shipping in US only. Bid on!!