Abstract: Provided herein are, among other things, a power sprayer comprising a housing, a trigger, a battery, a pump switch, a hose connector, a spray nozzle having a spray inlet and a spray outlet, a valve having a valve inlet and a valve outlet, a motor powered pump within the housing having a pump inlet and a pump outlet, wherein the valve outlet is in fluid communication with the spray nozzle inlet, the pump outlet is in fluid communication with the valve inlet, the pump inlet is in fluid communication with the hose connector, and the pump switch is electrically coupled to the motor powered pump and the battery.

Abstract: Provided herein are, among other things, an electronic pad comprising a weight sensor, a gas sensor, a processor and a wireless transmitter. Also provided herein is a safety and fuel level communication system comprising the electronic pad disclosed herein and a wireless transceiver. The electronic pad disclosed herein or the system disclosed herein can automatically provide a low gas level alert when the gas amount remained in a gas container on the electronic pad is below a pre-determined level and/or a gas leak alert when a gas leak is detected. Also provided herein is a method of providing a low gas level alert and a gas leak alert.