The Hosonic E1SB27E0X0005E is an SMD2016-4P Crystals with ROHS markings. It is a small oscillator module that consists of an oscillator circuit and a small quartz crystal, which acts as the frequency determining element. The module acts as an oscillator with a frequency range of 2.4MHz to 24.5MHz, and has a tolerance of ±50ppm or better when measured at 25°C. Its power supply comes in 2 forms, either 1.8V ±10% or 3.3V ±10%. The E1SB27E0X0005E is RoHS compliant, meaning it is free from hazardous substances such as lead, hexavalent chromium, cadmium, mercury, and brominated flame retardants.