DoorbellsRingtones:38 pcsDIY Supplies: ElectricalDoorbell Type: WirelessPower Source: AC,BatteryModel Number: A10BBPower supply: 110V-220V-240VWorking frequency: 433MHZRing Tone: 38 ring tonesCertificate: CE,FCC,RohsWaterproof : yesPower Source: Plug EU US UKVolume:3 files(can be mute) 0-85dbBattery mode: 12v 23A battery (not include battery)Receiving distance: 300M Remote (in open area)Suitable for: Home,office,villa,hospital,school,factoryThe transmitter 12V23A battery factory pre-installed (not include battery)The use of microprocessor control, double-sided PCB micro-power design.The frequency of 433MHz, can be customized other frequencie.Touch the button configuration, superheterodyne learning code on the code mode.The transmitter without screw chuck design to achieve waterproof and dustproof.Double-sided stability of the PCB, the chip standby sleep up to micro-level.Package Included:1 * Outdoor Transmitter1 * Indoor Receiver