Sound monitor for using indoors

A visual tool to monitor the sound level in a classroom or home or workplace. Can be mounted on a wall and a sensor indicates the sound level by lighting up the green, orange or red light. This comes with four AAA batteries and a charger. Batteries last up to four weeks after a 10-hour charge. Can also work off mains power through the charger. Brand new and in box. Promoted by the National Foundation for the Deaf to keep young children away of sound levels indoors. Size of the monitor 14 x 22 x 5 cms approx From smoke free and pet free home. Buyer can pick up from Mt Roskill, Auckland, or buyer to pay cost of postage by standard NZ post. Postage done on Friday only. Rural delivery extra postage cost Payment by cash or internet or fast deposit packet at a bank. DO NOT deposit cash with the teller at the bank as this incurs bank fees for the seller and the buyer. Start is reserve price. No offers made to watchers.