Features and specifications:
1.The button supports up to 20PCS, and the receiver supports up to 100pcs.
2.If multiple buttons are paired with one or more receivers in the same system, each button can be set to a different ringtone.
3. Power-off memory function: Turn the power on again after power off, no need to re-adjust and lock the ringtone.
4. The transmitter has no screw chuck design, and it can be waterproof and dustproof without rubber ring.
5.The transmitter USE a 23A12V alkaline battery (not included battery).
6. Receiver voltage: 110-220-240V.
7.Receiving distance:300 meters in open area.
8.The wireless signal will be affected by obstacles. The more obstacles, the more serious the signal loss.
9.Reciver has 5 levels(can be mute) 0-110db,60 music to choose from.
10.Size:Transmitter 75x51x20mm, Receiver 95x65x24mm.
NOTE:The button cannot be placed on an iron door because it will interfere with the signal.