Caution: color: we ship according to the color of the first picture, in the package: if the quantity is not stated in the description, we will ship the item according to the quantity and model number in the title. Spa pool thermotere wireless remote floating thermometer swimming pool spa hydromassage pond spa thermometer the product is shipped based on the color or size of the main image of the product page. Features:temperature measurement used in pool pond fish tank. Maximum temperature minimum temperature memory function. indoor temperature and humidity display. Outdoor temperature display. Outdoor high degree of waterproof performance. Descriptions:it has calendar, clock, alarm.There are and to choose. It is 30m waterproof, which sis suitable for using in the spa, bathtub or swimming pool. Specification:distance between sensor and the host : 100meters frequency: 433 hzo utdoor temperature range: -40 ~ 60 temperature sensor response time: 48 secondsindoor temperature range: 0 ~ 50 host sensors can detect three channelstemperature range in swimming pool: -40'c~60'c -40'f~140'f wireless transmission range: 100mtransmitter uses 2 x aa batteries not included the receiver uses 2 x aaa batteries not included material : abs product machine size : 12*7.5*2.2Cm package size : 17*13.5*10.3Cm package content:1 x wireless pool spa hot tub thermometer 1 x remote sensor