Long Range at 300 Metres Up to 300m/1000 feet wireless transmission Range in open area. Ensure a wide operation range for most houses. Inform you in time no matter you are preparing meals in the kitchen or watering in the garden. Free your worry about missing visitors. 36 CD Quality-sound Melodies with Adjustable Volume This option comes with 36 chimes and has four volume level 0-85dB to choose from - a great option for different environments. Flashing Light Indicator Special waterproof ring structure, will survive between -4 °F to 140 °F, withstands harsh weather conditions.You could install it anywhere inside, on your door frame outside or in your garden. SPECIFICATION: Size: 11.7 x 9 x 8.4 cm; 220 Grams Receiver input: 110V to 240V 50/60HZ Volume adjusting: 4 stage(0-85dB) Transmitter input: 12V 23A alkaline battery Working frequency: 433.92MHz Wireless range: 300 meter Battery life: 3 years PACKING LISTING: 1*Tansmitter 1*12V battery 2*Receiver 1*3M tape 1*Manual 1*Screwdriver