Multi Level Protections Over-heat protection, low water flow protection, anti-frozen protection, over water pressure protection, no flame protection etc. Exquisite Details & Connect Standard G12 copper water inlet outlet connector anticorrosion nonbroken after longtime high temperature use Both have filtration mesh to filter impurities in water Put in 2 "D" batteries into the bottom case to start this machine. Quick Install & Wide Use Instant 8Lmin gas water heater lightweight and spacesaving Wall mounted design, shower in the bathroom while machine installed in the kitchen, avoid the risk of toxic gas leakage during bathing. Come with a shower head kit as gift. Higher Burning Efficiency Use liquid propane gas(LPG) as main energy source, totally enclosed combustion structure, provide uniform fire and higher burning efficiency for gas saving. Auto shut down gas power under unexpected flame out, thus to ensure safety on use. LED Display & Control Knobs We adopt an LED screen to display realtime water temperature Gas control knob rotate it clockwise to increase the gas supply Water control knob turn it clockwise to get more hot water. Water temperature ranges from 50 °F to 140 °F.