Device for detecting the surroundings by emitting and/or receiving acoustic signals, comprising: a housing which has at least a first duct and a second duct which each connect an internal volume of the device to the surroundings of the device, a transducer unit which is configured to output an acoustic signal in a first direction and in a second direction and/or to be excited by an acoustic signal from a first direction and a second direction, wherein the first duct ends on the side of the first direction with respect to the transducer unit, and the second duct ends on the side of the second direction with respect to the transducer unit, and wherein the transducer unit is arranged in the internal volume of the device and is arranged with respect to the ducts (3, 4) in such a way that - soundwaves which are output by the transducer unit are directed to the surroundings of the device via the ducts (3, 4), and/or - soundwaves from the surroundings of the device are directed to the transducer unit via the ducts (3, 4), wherein the transducer unit comprises an electroacoustic transducer and a first diaphragm, wherein the electroacoustic transducer is configured to excite the first diaphragm to oscillate and/or to be excited to oscillate by this first diaphragm, characterized in that the transducer unit also comprises a second diaphragm, wherein the electroacoustic transducer is configured to excite the second diaphragm to oscillate and/or to be excited to oscillate by this second diaphragm, wherein - soundwaves which are output by the first diaphragm are directed to the surroundings of the device via the first duct, and soundwaves which are output by the second diaphragm are directed to the surroundings of the device via the second duct, and/or - soundwaves from the surroundings of the device are directed to the first diaphragm via the first duct and are directed to the second diaphragm via the second duct. a housing which has at least a first duct and a second duct which each connect an internal volume of the device to the surroundings of the device, a transducer unit which is configured to output an acoustic signal in a first direction and in a second direction and/or to be excited by an acoustic signal from a first direction and a second direction, wherein the first duct ends on the side of the first direction with respect to the transducer unit, and the second duct ends on the side of the second direction with respect to the transducer unit, and wherein the transducer unit is arranged in the internal volume of the device and is arranged with respect to the ducts (3, 4) in such a way that - soundwaves which are output by the transducer unit are directed to the surroundings of the device via the ducts (3, 4), and/or - soundwaves from the surroundings of the device are directed to the transducer unit via the ducts (3, 4), - soundwaves which are output by the transducer unit are directed to the surroundings of the device via the ducts (3, 4), and/or - soundwaves from the surroundings of the device are directed to the transducer unit via the ducts (3, 4), wherein the transducer unit comprises an electroacoustic transducer and a first diaphragm, wherein the electroacoustic transducer is configured to excite the first diaphragm to oscillate and/or to be excited to oscillate by this first diaphragm, characterized in that the transducer unit also comprises a second diaphragm, wherein the electroacoustic transducer is configured to excite the second diaphragm to oscillate and/or to be excited to oscillate by this second diaphragm, wherein - soundwaves which are output by the first diaphragm are directed to the surroundings of the device via the first duct, and soundwaves which are output by the second diaphragm are directed to the surroundings of the device via the second duct, and/or - soundwaves from the surroundings of the device are directed to the first diaphragm via the first duct and are directed to the second diaphragm via the second duct. - soundwaves which are output by the first diaphragm are directed to the surroundings of the device via the first duct, and soundwaves which are output by the second diaphragm are directed to the surroundings of the device via the second duct, and/or - soundwaves from the surroundings of the device are directed to the first diaphragm via the first duct and are directed to the second diaphragm via the second duct.