Compatible for Makita18V Batteries BL1815 BL1820 BL1830 BL1830B BL1840 BL1850 BL1850B BL1860 etc. Input: DC 12/24V. When the red light is always on, it shows the charging process. R1234YF to R134A Low Side Quick Coupler Adapter Car Air-Conditioning Fitting.