Quick view Add to Cart The item has been added Securitron TS-4R-CBO Sensor Board for TSB Series - Securitron MSRP: Was: $190.00 Now: $132.80 A sensor electric circuit board. Circuit board only for Securitron TSB series, wires not included - use CAB-6 wire. Resources 5202_10… California Prop 65 Warning WARNING: This product can expose you to chemicals including Nickel, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.