Features : It is a frequency tester of remote control, which can test the frequency of remote control exactly and show out clearly. It make you easy to adjust the exact frequency that you want when you are confecting the remote control. Working voltage: DC 7.5-10 V Working current: 51mA Standby current: 40mA Test coverage: 250-450MHZ Test distance: 10cm 7.5~10V 5 size : 92*56*24(approx) Test method: So long as you approach the remote control to the tester not above 10cm, it can test your remote control exactly. Application range: Electric door controller, auto door etc burglar alarm controller .remote control, electric lock, garage door remote control ,entrance guard ,and so on. Package Content: 1 x Frequency Counter 1 x Power supply cable (Batteries not included) Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.