MAIN CHARACTERISTICS range of product HARMONY XB4 accessory / separate part designation BLANK accessory / separate part type SHEET OF CIRCULAR LEGEND accessory / separate part category MARKING ACCESSORIES accessory / separate part destination PB SWITCH OR PILOT LIGHT marking UNMARKED sale per indivisible quantity 10 COMPLEMETARY CHARACTERISTICS product compatibility XB4B range compatibility HARMONY XB4 product weight 0.017 KG shape of signaling unit head ROUND