18TRANSMIT TER USAGE & C AREPRECAUTIONSYour 2-button transmitter is a fairly durable device that can endure com-mon jolts or falls from a pocket. (Be aware that falls on hard surfacesmay nick the plastic or the painted surface.) Your transmitter can evenbe submerged in water to 1.8 meters (5.9ft.) However, your transmittercan still be damaged by excessive heat, direct sunlight for extended peri-ods, rapid movement through water (we advise against diving/surfing withyour transmitter). If water gets inside, remove batteries and allow to drythoroughly before testing.CHANGING THE BATTERIESThere are two CR1616 Lithium button-cell batteries inside your transmit-ter, which last about 1 year with normal every-day use. When the batteryis getting low, the range will become shorter and the LED will become dimor not light at all. Snap open the case at the keychain hole to open. Becareful when snapping open the case with a screwdriver, so you don’t dentthe plastic.COMMUNICATION RANGEYour transmitter’s range is adversely affected by RF noise. However, thetypical in-city range is often greater than 20m (>65ft), and normal range inthe country side (or any low RF noise area) can be as high as 50m (165ft.).Please keep in mind, however, that if metal objects (coins in your pocket)come in contact with the transmitter, range may be adversely affected.Also, your proximity to high-power TV station antennas and or powerfulmobile phones will also limit range.REPLACEMENT CASESIf you damage your transmitter’s plastic case, or if you simply want tochange the color and style of your case, VISION offers four models tochoose from: TX-23 Black, TX-23W Burlwood, TX-23L Blue Metallic, TX-23F Hawaiian Flower. You can view photos of these replacement cases onour website at this URL: http://visionsecurity.jp/en/parts/OPERATION