1:the remote control distance up to 250 yards. 2:Each device built-in 50W speaker,the sound maximum can reach 150dB. 3:Built-in 182 bird sounds,professional recording with clear and vivid sounds. 4:Remote supports 3 hotkeys,hunters can save 3 commonly used sounds, one-key enable,flexible operation. 5:The host use external 12V power supply,the remote use 3*AA batteries(Not include the battery). 6:Host Size: Ф100*80MM Remote control Size: 130*57*27MM 7:Weight: 0.7KG/SET