Press it with the point of a blunt object (such as a ball point pen) whenever you change the batteries, or whenever performance is not behaving as expected (e. , unable to establish radio frequency link with main unit). Refer to the User Manual for the main unit for more information. SAFETY AND CARE Wash the unit with a slightly damp cloth and mild detergent. Avoid dropping the unit or placing it in a high-traffic location. Do not expose the unit to direct sunlight since this may affect the accuracy of measurements. WARNINGS This product is designed to give you years of service if handled properly. Observe the following guidelines: · · · · Never immerse the unit in water. This can cause electrical shock and damage the unit. Do not subject the main unit to extreme force, shock, or fluctuations in temperature or humidity. Do not tamper with the internal components. Do not mix new and old batteries or batteries of different types. Do not use rechargeable batteries with this product. Remove the batteries if storing this product for a long period of time. Do not scratch the LCD display. · · 7 EN EN · Do not make any changes or modifications to this product. Unauthorized changes may void your right to use the product. The contents of this user manual are subject to change without notice. Images not drawn to scale. TROUBLESHOOTING Check here before contacting our customer service department. Check location (à 5) Problem Temp Symptom Main unit shows "LLL" or "HHH" Cannot locate main unit Remedy Temperature is out-of-range. · · Remote unit Check batteries (à 6) 8 SPECIFICATIONS Dimensions LxWxH Weight Temperature Unit Range Resolution °C or °F -20 °C to 60 °C (-4 °F to 140 °F) 0. 1 °C (0. 2 °F) 9 Frequency RF frequency 92 x 60 x 20 mm (3. 6 x 2. 4 x 0. 8 inches) 63 grams (0. 1 lbs. ) without batteries Range Transmission Channel No...