An apparatus comprising: a blender jar having first and second engagement members; and a blender base including: a motor to drive a drive coupling; ajar mounting portion to receive the blender jar; first and second engagement member receiving slots configured to receive the first and second engagement members, respectively, via rotation of the blender jar relative to the base by a user such that each of the first and second engagement members moves through a lateral portion of its respective slot; the first engagement member receiving slot having a movable member within the lateral portion, the moveable member being configured to be moved by rotation of the first engagement member into the lateral portion; and one or more switches which are: required to be toggled to permit operation of the motor; and can be toggled by movement of a movable member in at least one of the first and second receiving slots; wherein the movable member is arranged to retain the first engagement member in the first receiving slot without each of the one or more switches being toggled; and additional user force on the jar after the first engagement member has been retained in the first receiving slot toggles the one or more switches that are required to be toggled to permit operation of the motor. a blender jar having first and second engagement members; and a blender base including: a motor to drive a drive coupling; ajar mounting portion to receive the blender jar; first and second engagement member receiving slots configured to receive the first and second engagement members, respectively, via rotation of the blender jar relative to the base by a user such that each of the first and second engagement members moves through a lateral portion of its respective slot; the first engagement member receiving slot having a movable member within the lateral portion, the moveable member being configured to be moved by rotation of the first engagement member into the lateral portion; and one or more switches which are: required to be toggled to permit operation of the motor; and can be toggled by movement of a movable member in at least one of the first and second receiving slots; wherein the movable member is arranged to retain the first engagement member in the first receiving slot without each of the one or more switches being toggled; and additional user force on the jar after the first engagement member has been retained in the first receiving slot toggles the one or more switches that are required to be toggled to permit operation of the motor. a motor to drive a drive coupling; ajar mounting portion to receive the blender jar; first and second engagement member receiving slots configured to receive the first and second engagement members, respectively, via rotation of the blender jar relative to the base by a user such that each of the first and second engagement members moves through a lateral portion of its respective slot; the first engagement member receiving slot having a movable member within the lateral portion, the moveable member being configured to be moved by rotation of the first engagement member into the lateral portion; and one or more switches which are: required to be toggled to permit operation of the motor; and can be toggled by movement of a movable member in at least one of the first and second receiving slots; required to be toggled to permit operation of the motor; and can be toggled by movement of a movable member in at least one of the first and second receiving slots; wherein the movable member is arranged to retain the first engagement member in the first receiving slot without each of the one or more switches being toggled; and additional user force on the jar after the first engagement member has been retained in the first receiving slot toggles the one or more switches that are required to be toggled to permit operation of the motor. the movable member is arranged to retain the first engagement member in the first receiving slot without each of the one or more switches being toggled; and additional user force on the jar after the first engagement member has been retained in the first receiving slot toggles the one or more switches that are required to be toggled to permit operation of the motor.