The router device is able to use either battery power or a commercial power supply, and when using battery power detects battery voltage and indicates the level of battery voltage with an LED. The device includes a base, an arm mount coupled to the base, a support arm rotatably connected to the arm mount, and a tubular guide coupled to support arm. Multiple light sources may be used including tunable lasers. 0% by weight of an anionic surfactant and 0. A bore forming fluid passage communicates with the interior of the needle. In the battery pack, the detector detects current values before and after the voltage value of the battery group is detected, and the controlleroperator determines that the voltage value of the battery group is influenced by the peak discharge power when at least one of the current values exceeds a predetermined threshold.