The QRS Series is a modular quantum receiving hardware module designed for entanglement-based communication systems and BBM92 protocol implementations. Featuring an integrated, pre-aligned internal optical bench with four silicon single-photon detectors (SPDs), it removes the requirement for external polarization setups. The series can be factory-optimized to function as either Alice or Bob . It is offered in a standard laboratory enclosure or a compact, CubeSat-compatible (S) grade for integration into small satellite quantum payloads.