The buttons are made of soft silicone and have a very . Two button versions are available: the pager has one button and three buttons. Strong signal: stable transmission through walls, indoor coverage area can reach 1500 square meters. Low power consumption, long standby and long battery life. Advanced low power consumption technology to long battery life. Waterproof body design, no fear of water and oil intrusion. Wireless Waterproof Call Button Frequency: 433.92MHZ Transmitting power: +13 DBM Battery: 12V23A Note This is buttons only, they have to work with receiver Note: Due to different production batches, there may be slight differences in products. Colour:White Material:ABS Specification: 3 buttons Package Contents: 1 x Wireless Watch Transmitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.