SINGCALL Wireless Construction Site Calling System for Calling Elevator, Small Receiver With Storage Battery SC-R10GX: 01. Special construction site receiver for calling elevator. With storage batterynormal work without connecting power supply, 5-6 hours of standby time. Can also work with power adapter. 02. Registred number can not be register again, avoid repeated registration to the same number. 03. Display 3 groups of double-digit number at the same time. 04. Prompt modes: Dingdong, Alarming sound, voice report 05.Can work with 199 pagers at most. APE500: 01. 360degree waterproof. Sturdy construction, stable performance, sun-protection, dust proof, antiknock 02. Long transmitting distance, 150ft in the building, 3000 ft in the open air. 03. Can change numbers easily, strong reusability. 04. Can mark the number and floor. Dimensions: 7.95*5.12*1.18in(202mm * 130mm * 30mm) Net weight 1.10 lb(500g) Outer material: ABS Decoding type: Registration method Number of display : 3 groups Power supply: Lithium battery (800mAh 12V) or AC120V/60HZ-DC12V/1A Prompt music length: 01-15 kinds (one figure means two seconds,30 seconds max) Receiver sensibility: -114dbm Frequency: 433Mhz Call button capability: 199 Prompt modes: Dingdong, Alarming sound, voice report Display time: 1-99 seconds,00 means infinite English letter beginning display: A,B,C,D,E,F,H,P,L,J. Dimensions: 3.54*2.36*1.2 inches (90mm * 60mm * 30.5mm) Shell material: ABS(imported from Taiwan) Superficial treatment: Polishing Color: Milk white Key surface material: PC imported from Taiwan Key life: million times Frequency: 433.92MHz Transmitting distance: 130-200ft indoors, 1600ft in the open air Power supply: Alkaline Battery 12V 23A Battery life: about 12-18 months The degree of waterproof: 360 degree waterproof Adapted receiver: all of SINGCALL receiver