The Clearance Z-3 TIR is a previous generation model. These units DO NOT sync together, but they still work great! They still have all other features detailed below and are a great low-cost option for scatter warning light flashing!
Dual Color Z-3® Description:
The Dual-color Z-3 has 3 modes; Color A, Color B, and Color A/B. Every time it is turned on, it will default to Color A, so in order to get the other modes (Color B and Color A/B), you will need to cycle through the modes until it flashes in the desired configuration. The easiest way is to attach the Blue wire to a positive momentary switch.