Amarine-made PN-TV1-4 5-30V Digital Battery Voltmeter Test Panel Rocker Switch DPDT On-Off-On for Marine Boat RV PN-TV1-4 BATTERY TEST PANEL FOR 2 BATTERY SETS Backlight LED indicator for each switch, lights up when switch is turned on Manufactured from durable UV Resistant plastic panel with reinforced corners to prevent cracking. digita voltmeter Weatherproof and Rubberized Switch 12 volt 20 amp heavy duty switch