NOTE: The collar comes with a standard black non-bungee collar strap, but you can choose to replace this with a mini-bungee collar strap from a range of colours. 300 Micro System has a smaller collar (RX-070) than the ET-300 Mini System (RX-090). The receiver can also programme into any existing 300, 400 or 900 series transmitter and is designed with the smaller dog in mind - this provides for a handler to run a big dog and a small dog off the same transmitter. Approximately 20% smaller and 20% lighter than the RX-090, its unique design allows the user to turn it 90 degrees on the strap so contact points can be before and aft if necessary for a very small neck. Contact points are 2.5 cm apart from one another rather than the traditional 3.2 cm span. Compatible with all current transmitters including the ET-300, ET-400 and EZ-900 and more. 100 levels with 'Lock and Set' option. Night blue LCD display on transmitter. Remote tracking light on collar. Momentary and continuous buttons. Tapping sensation button (improved vibration) with tone option too. Floating transmitter. 2-hour quick charge (Li-polymer batteries - charger included). Lost transmitter beeper option. Completely waterproof to 500 metres. Shock resistant to 5000 Gs. Expandable to two collars. 2-year manufacturer's warranty. USA designed and assembled. Great NZ backup service. 500-metre range. Check out our Mini Bungee straps - perfect for your small dog. Comes with purple transmitter skin as standard.