The Libella EcoPower Faucet Series from TOTO USA has deck- and wall-mount options. They are energy-efficient, harnessing the electricity generated by flowing water to power their electronics, so there’s no need for hardwiring or disposable battery replacement. There is no minimum daily usage required. Their accurate spout-tip sensor detects hands before releasing water and shuts off immediately once hands are removed, saving water. The predetermined flow rate is 0.5 gpm, or 0.09 gallons per 10-second cycle, 64 percent below the 0.25 gallons-per-cycle baseline for high-efficiency faucets. 770/282-8686; www.totousa.com.