This document describes a 40G 850nm 100m/300m SR4 QSFP+ optical transceiver made by Guilin GLsun Science and Tech Group Co., LTD. It includes specifications for the transceiver such as its form factor, number of lanes, data rates, fiber type support, wavelength, power consumption, temperature range, pin definitions, optical characteristics, and ordering information. The transceiver integrates four data lanes with 40 Gbps bandwidth and supports short-range multi-lane data communication over multimode fiber.