The ECS-33B2 from ECS International is a Quartz Crystal that operates from 10 to 54 MHz. It has a frequency stability of ±15 ppm and an aging of ±2 ppm (for the first year). This oscillator has an operating temperature range from -40°C to +85°C. It is available in a ceramic surface-mount package that measures 3.2 x 2.5 x 0.8 mm and is ideal for IoT, smart home sensors, BTLE, Wi-Fi wireless, low aging, and wearable applications.