Features:
One transmitter matches three receivers.
Different receivers can be controlled by different buttons on the transmitter.
Credit card sized transmitter fits in any wallet or purse.
Key chain receiver can be connected with your devices easily like keys， wallets， etc.
Adopts RF wireless technology， stable performance.
Anti-lost function， easy and quick to locate your items.
Long working distance.
No radiation， environmental protection.

Specifications:
Working distance: 25-30m (in open field)
Working frequency: 433.92MHz
Working voltage: 3V
Current: 2mA
Power supplied by: transmitter: 1 * CR2016， receiver: 1 * CR2032
Transmitter size: 8 * 5 * 0.4cm / 3.1 * 1.9 * 0.1in
Transmitter weight: 14g / 0.5oz
Receiver size: max. 4.4 * 2.8 * 1.2cm / 1.7 * 1.1 * 0.4in
Receiver weight: 11g / 0.3oz
Package size: approx. 20.5 * 14.2 * 2.2cm / 8 * 5.6 * 0.8in
Package weight: 81g / 2.8oz

Packing list:
1 * Transmitter
3 * Receivers