The Circuit Jammer is a weapon featured in Going Mobile and Clone Home, as the Circuit Breaker. It has a black and silver design, with three prongs that each fire bullets in a series. The bullets automatically change direction to home in on nearby enemies.
In the Series 40 version of Going Mobile it is available at the Weapon Store for 950 bolts. However, in the Series 60 version it is instead obtained for free from Al upon completing the Communication Station for a third time. Al grants it to you as it can destroy certain walls, which they needed to access a vault and steal the Payola in the Megakill Blast Arena. This ability is required to collect some of the titanium bolts as well. In Clone Home the weapon, now called the Circuit Breaker, is instead acquired for free at the end of the High Speed Transfer level.
The Circuit Jammer in action.
Both the Circuit Jammer and Circuit Breaker are relatively weak at first, but becomes relatively useful once fully upgraded to V3. Although the weapon has a fast rate of fire, the bullets are slow, making it tedious to use on distant enemies when in their line of sight. However, the bullets' automatically home on available targets, allowing careful players to just attack enemies out of their range.