RELIABLE & DURABLE- 20+ years working in the electronics and wireless transmission field to ensure HTZSAFE has enough experiences to make the products reliable and durable.HTZSAFE promise 2 YEARS WARRANTY and 90-DAY RISK-FREE OFFER. LONG WIRELESS RANGE- Adopt FSK+FHSS wireless transmission technology to avoid the other wireless frequency signal interference. the wireless range from the remote push button to the plug-in receiver is up to 1000 feet(actual range will vary depending on the local ter