Includes: 1 Wahoo Key 1 Wahoo Fitness Soft Heart Rate Belt Note: Please see individual product pages for full product details Features: very low power usageno internal battery compact yet ruggedsimilar size to iPhone charging plug compatible with iPhone 3G, 3GS, 4, iPod touch, iPadfits into 30-pin connector sends and receives signals up to 10 feetunobstructed wirelessANT+ AP2 ultra low power technology licence free, 2.4 GHz ISM band operation Weight 3.5 grams (0.12 ounces) Color black