actual size SMD Quartz Crystal JXS21-WA - for wireless applications, 2.0 x 1.6 mm - perfect reference crystal for wireless applications - for IoT using BlueTooth, ZigBee, NFC and more - high frequency stability and low ESR - metal lid allows EMI shielding RoHS 2011/65/EC RoHS compliant Pb free REACH compliant Conflict mineral free GENERAL DATA TYPE JXS21-WA special frequencies for wireless applications 14 standard frequencies shown in ESR list (for other frequencies refer to gene.