Hi there, thank you so much for showing interest! The Solar Motion Detector 1 was the first device we ever listed in 2019 and we have sold more than 10 000 units to date! This little guy is perfect to make you aware of movement and also one key point is that it bewilders any threat. A couple of farmers has even shared that it keeps the Koedoes out of their fields! - Covers an area of 5 to 8m at 110 degree angle - Siren was measured at roughly 110db - Can be set and left to auto arm at night and