Cisco Unified IP Phone 6921 is an innovative terminal device that supports two numbers and a full-duplex speakerphone, which can create a more efficient, flexible and easy-to-use terminal device experience. Cisco Unified IP Phone 6921 adopts a single number and a single call mode, providing a call experience similar to traditional phones, which can meet the needs of customers who want to provide such call functions for their users. Fixed buttons for hold, transfer and conference functions; and three-color LED lines and function keys make the phone easier to use. Cisco Unified IP Phone 6921 provides greater personalization support, with two color and two handset styles available. In addition, the display also supports right-to-left language display, which can meet the language localization needs of global customers. Cisco Unified IP Phone 6921 is also more energy-efficient and environmentally friendly, and can better support customers' green plans. Deep sleep mode can significantly reduce power consumption. In this mode, the Cisco Unified IP Phone 6921 consumes less power during non-office hours than when the phone is idle during normal working hours, up to 50%. In addition, recycled plastics provide a more environmentally friendly solution.

Solinst 800 Series Low Pressure Air Separators are simple and inexpensive, hand-pumped air separators, available in 1.8 inch and 3.7 inch (46 mm and 94 mm) diameters. Designed primarily for use in 2 inch and 4 inch (50 mm and 100 mm) monitoring wells, they can also be used in smooth-bore wells and in wells with an inside diameter of 1.9 inches to 5 inches (48-127 mm). Typical inflation pressures are 20 to 40 psi (140-345 kPa) acting on the hydrostatic head for the 1.8 inch separator and 20-30 psi (140-205 kPa) for the 3.7 inch (94 mm) separator.

This user guide introduces the Lectrix online tool. Lectrix is an online tool for learning Greek and Latin original texts. It can help users to easily read original texts, and provides translations and annotations. This guide introduces how to use Lectrix's various features, including text browsing, text translation, annotation translation, grammar analysis and dictionary definitions.