9.5mAh Battery For Polycom KIRK 5020, 5040, SpectraLink KIRK 5020, 5040 Please ensure both model and battery part number are matched with your device. - Compatible Model: POLYCOM 5020, 5040, KIRK 5020, KIRK 5040, SPECTRALINK 5020, 5040, 7520, 7540, KIRK 5020, KIRK 5040, - Compatible Battery Part Number: POLYCOM 84743424, ICP73048, SPECTRALINK 84743424, ICP73048, - RoHS approved for toxic free. - CE and ISO9001 Certificate for quality assurance.