Features: Frequency: 433 Hz Maximum range of transmitter and receiver: 100 feet Indoor temperature range: 0 to 50 degrees Celsius Outdoor temperature range: 40 to 60 degrees Celsius Temperature sensing reaction time: 48 seconds Wireless receives 3 channel water temprature Emitter battery: 2x AA (excluding battery) Receiver battery: 2x AAA (excluding battery) Waterproof and floating of outdoor sensor. Transmitter dive up to 10m and no water leakage. Description: 1. Floating transmitter with better waterproof effect than ordinary pool thermometer. 2.Lengthen sensor design for more accurate temperature measuring. 3.To measure indoor temperature and swimming pool temperature wireless connection easy to check the pool temperature indoor. Note: 1.Tighten the cover of the transmitter before use. 2.Please put it in the basin for 3 minutes until there are no bubbles coming out and put it in the pool. 3.Please allow slight deviation due to manual measurement. 4.Due to the differences between the different monitors the image may not reflect the actual color of the project. includes: 1 X Transmitter (Not including battery) 1 X Receiver ( Not including battery ) 1 X User Manual "