The SHOCKWAVE speaker system has two horn speakers and two tweeters for excellent sound quality and volume capability. There are 2 external speaker jacks for more volume, an auxiliary jack to connect an approved device such as a Jack Predator Decoy and a charge jack. The SHOCKWAVE comes with 100 high quality FOXPRO sounds with the ability to store and access up to 1,000 sounds. You can operate it manually or with the SHOCKWAVE TX1000 transmitter. The transmitter features a full color graphic LCD screen which displays your sound list or sound categories, has a barometer indicator, moon phase indicator, temperature indicator, battery level indicator, timer or time clock, FOXBANG technology and much more. Includes 10AA battery holder, TX1000 transmitter and mini USB cable.