maximum range of about 100 meters (in open field) Volume approximately 82 dB ( A) 8 melodies (call differentiation ) Belt clip and wall mount 1 LED ( red) as a call signal weatherproof transmitter IP44 with nameplate incl. 1 x 3V CR2032 battery Receivers Batteries not included ( 2 x 1.5V LR14 / baby) 256 radio frequencies with self-learning coding Dimensions: 107 x 62 x 33 recipients mm / transmitter 32 x 82 x 20 mm Color: silver Compatible / upgradeable with all HX devices