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Additional or Replacement, Three channel Wireless Temperature & Humidity Sensor, 433MHz Compatible with Youshiko YC9337 and YC9432 only ( don't buy this for any other model or brand or make please) Transmits up to 90 feet from the main unit. Wall mounting or Desk top / Table standing , Weather proof casing (Please mount this sensor outside in a sheltered place to avoid direct heavy rain and direct sunshine for best results / readings) . Requires 2 x AA battery (not included)