Set of 2 sound/shock sensors and receiver chimes Only opened, intended for installation at my parents' home. The double-sided tape has been used, but not actually applied. Wireless receiver chime with a maximum reception range of 180m, capable of loud notifications at 64 decibels. - Brand: REVEK - Model: XP4000 - Type: Wireless receiver chime - Volume setting: 64 decibels - Reception range: Up to 180m - Power supply: AC adapter Sound/shock sensor transmitter with a maximum wireless communication distance of 180m. - Brand: REVEK - Model name: XP60 - Maximum communication distance: 180m - Function: Sound/shock sensor transmitter - Usage: Easy installation, no distribution required Thank you for viewing.