Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a station (STA). In certain configurations, the STA transmits a request-to-send (RTS) frame in an enhanced long range (ELR) format for obtaining a transmission opportunity (TXOP). The STA receives a first clear-to-send (CTS) frame in the ELR format or a non-ELR format responding to the RTS frame. In response to receiving the first CTS frame, the STA transmits data in the ELR format in the TXOP. In certain configurations, the STA further receives an acknowledgement in the same format as the first CTS frame for responding to the data being transmitted. In certain configurations, prior to transmitting the RTS frame, the STA transmits a CTS-to-Self frame in the non-ELR format.

Abstract: A double-sided mop according to this invention, being provided to solve the problems of a conventional mop on poor floor mopping quality, includes a mop pole, a mop head connecting to the mop pole, and a cleaning cloth provided on the surface of mop head. The mop head includes a mounting plate, a first panel, a second panel, a hinged shaft, a universal joint, and an elastic part, in which the mounting plate is provided between the first panel and the second panel, the mounting plate is hinged and connects to the hinged shaft together with the first panel and the second panel, the elastic part applies a force to clamp the first panel and the second panel, the universal joint is installed on the mounting plate by rotation, and the mop pole connects to the universal joint.

Abstract: A double-sided mop according to this invention, being provided to solve the problems of a conventional mop on poor floor mopping quality, includes a mop pole, a mop head connecting to the mop pole, and a cleaning cloth provided on the surface of mop head. The mop head includes a mounting plate, a first panel, a second panel, a hinged shaft, a universal joint, and an elastic part, in which the mounting plate is provided between the first panel and the second panel, the mounting plate is hinged and connects to the hinged shaft together with the first panel and the second panel, the elastic part applies a force to clamp the first panel and the second panel, the universal joint is installed on the mounting plate by rotation, and the mop pole connects to the universal joint.