Specifications:
Transmitter size: 4.71 x 1.49 x 0.67 inches
Receiver size: 2.24 x 1.06 x 0.19 inches
Frequency: 433.92 MHz
Volume: 80-90 dB
Working range: 50-131 ft (open space)
Battery: 8 x CR2032 batteries (for receiver and remote control, not included)
Case material: Fabric and ABS
Package contents:
2 x transmitters
8 x receiver
8 x key rings
8 x Velcro straps
8 x CR2032 batteries (for receiver)
1 x user manual (English language not guaranteed)