Product specifications :

• Dimensions: 6.7cm (L) x 6.7cm (W) x 2cm (H)
• Power: 0.25W
• Voltage: AC 110 - 220V
• Frequency: 433MHz

• Plug-and-play receiver and waterproof transmitter; no installation or batteries required.
• Transmits up to 100m.
• Four levels of volume adjustment and 38 bell tunes to choose from.
• Features 3 relay function, allowing users to boost transmission range up to 300m.
• Harnesses energy from 350g of pressure.