Feature This product is a test wireless remote control frequency instrument, it can test the frequency ofthe remote control, can be clearly displayed. Can test the infrared induction is good or badIt is convenient for you to adjust the frequency you need when preparing the remote control. The front of the instrument is equipped withLED lighting , which is more convenient in bad light Place in use. When testing , some electronic signal interference sources should be avoidedsuch as signal towers,base stations,telephone poles,sending and receivingText messages et. IR is infrared receiving lamp. Specifications: Test range : 100M- 1G HZ Size : 150x75x30 ( main part ) Working conditions : -10 C-40 C Relative humidity andlt 80 percent Storage conditions : -20 C-50 C Relative humidity andlt 85 percent . Package List: 1XFrequency Tester 1XBattery 1xinstructions