Digital Frequency Counter Tester Indicator Detector Cymometer Remote Control Transmitter Wavemeter 250-450MHZ Low Price on SaleRemote Control Transmitter Mini Digital Frequency Counter (250MHZ-450MHZ)Mini Digital Frequency Counter Features:1. Application range: Electric door controller, auto door etc burglar alarm controller,garage door remote control, entrance guard, etc.2. Display Type: digital only3. Working voltage: 9V(External 9V battery 6F22, not included)4.Working voltage: DC 7.5-12 V5.Working current: 50mA6.Standby current: 37mA7. Test coverage: about 3-4cm8. Dimensions: 92*58*25mm9. Measuring Range: 250MHZ-450MHZPackage including:1 x Frequency Counter1 x Power cableBecause battery is not allowed to ship with simple airmail, so we remove the battery from package. You can buy battery in your local market