2-Pack Aluminum Transmitters for TireMinder TPMS (TMG400C, TM66 and A1A) Extra TireMinder Transmitter for TireMinder A1A, TM66 and TMG400C TPMS TPMS for Car, Light Truck, SUV or Any Other Vehicle with Aluminum Valve Stems Replaceable Battery with 9-14 Month Lifespan (CR1632) Simply Replaces Valve Cap; Small, Light, and Out of the Way (0.4 OZ)