We have found that Fox has 2 generations of these alarms. 

The 1st gen individual alarms and individual receiver will not work with the prepackaged sets. 

You can purchase 3 or 4 of these alarms (they are 1st gen ) and receive the receiver for free with free shipping! 

You must put the alarms and receiver in your cart for the deal to apply.

 These do not have a case to store the set in.

• A modern re-worked version of the old school classic Mini Micron Bite Alarm boasting a number of great new features including receiver technology.
• Volume control button with seven levels
• Tone control button with four settings
• Sensitivity control button with four different settings
• Drop back differential
• Mini Micron X Receiver. 2 AAA batteries. (not included)
• Alarm takes small N Type/ LR1 batteries. 2 per alarm (not included)
• Two Ø5mm High Vis Multi coloured LED’s, Green, Blue, Red and Orange
• Colour selected by holding down volume button and pressing sensitivity button to change
• Adjustable LED brightness
• LED’s adjusted by holding down volume button and pressing tone button
• D-Tec Sensing System/Roller wheel technology for clear, consistent bite detection
• Power out socket 2.5mm – for use with illuminated bite indicators such as the Fox Illuminated Swinger®
• Low battery warning
• Batteries are too low when the LEDs automatically begin to flash red every 2 seconds
• Cone speaker for crisp sound
• Rubber inlays to protect your rod and hold it in place on savage bites
• On/off toggle switch
• Knurled locking collar
• Metal (Alloy) 3/8 BSF thread
• Top tip: For the best bite indication always use in conjunction with a Bobbin, Hanger or Swinger®