ECS ECX-34R SMD Tuning Fork Crystal is an ultra-miniature crystal with a very low equivalent series resistance (ESR) rating, which is ideal for low-power real-time clock (RTC) applications. The crystal is RoHS compliant and features a low-profile 3.2mm x 1.5mm footprint. The ECS ECX-34R SMD Tuning Fork Crystal offers a 50KΩ ESR, a 32.768KHz frequency rating, and a ±20ppm frequency tolerance within an extended -40°C to +85°C operating temperature range. The ECX-34R crystal is ideal for mobile devices and wireless applications.