SIMATIC S7-1200, Battery Board BB 1297 for long-term buffering of the real time clock, plug-in in the signal board receptacle of the S7-12XX (FW3.0 or higher); Battery (CR1025) not included in scope of delivery . Weight:0.023 KG , Size:5.00 x 8.20 x 2.90 CM , HS Code:85389091