Wireless Security Door Phone Intercom

Features: · Outdoor unit runs on 4 x AA batteries (energy saving circuit, lasts up to 1 year) · 240v power adaptor included for indoor unit · 1.8Ghz digital interference free wireless operation · Adjustable volume · Up to 150m working distance · Suit a variety of applications · Outdoor unit suit wall mount or flush mount Measurement: Outdoor unit: 11cm (W) x 16cm (H) x 5cm (D) approx Indoor unit: 10cm (W) x 22cm (H) approx Got my older kid to purchase this off Ebay for me, $89.99 + $11.90 postage (I don't have a credit/debit card and obviously never used a ATM thing) We have a high front fence with gates and the top pad bolt is always closed so people have trouble just getting to our front door to ring the doorbell. It's quite a journey (from upstairs) to go down the stairs, out the front door and up the driveway to open the gate only to discover it's someone who wants to swap your power, gas, phone or internet. Now all we have to do is look out the balcony window and talk to them over the intercom - no thanks.